Mostrando postagens com marcador snapdragon 800. Mostrar todas as postagens
Mostrando postagens com marcador snapdragon 800. Mostrar todas as postagens

quarta-feira, 29 de janeiro de 2014

CES 2014: Samsung Announces Galaxy NotePro and TabPro tablets


In their pursuit for dominance in the tablet market in 2014, Samsung has announced, at its CES 2014 show, four new tablets under the NotePro and TabPro names. The Galaxy NotePro 12.2 takes the spotlight, while the Galaxy TabPro 12.2, 10.1 and 8.4 followed it. As the Pro designation suggests, these are high-end tablets, hence, they'll be on the expensive side. All four Galaxy Pro tablets feature 2560 x 1600 displays and are available in Wi-FI only and LTE versions, and are powered by either the Exynos 5420 processor or the Qualcomm Snapdragon 800.

Galaxy NotePro and TabPro 12.2

This is perhaps the most interesting of these four tablets. The Galaxy NotePro 12.2, basically a larger Note 10.1 (2014), explores a display size that is seldom used in tablets. Some people (me included) think that 12.2" is too large for a tablet, while others may appreciate the extra screen real estate. The NotePro 12.2 has a very high 2560 x 1600 resolution, which leads to a 247ppi pixel density, just shy of the iPad's 264ppi (but then again, 1600p is pretty much the limit for tablets for the time being). The tablet is 8mm thick and weighs 750g for the Wi-Fi version and 753g for the LTE version. It's a very heavy tablet due to its footprint, but I suppose that the weight must be well distributed. The Wi-Fi variant is powered by an Exynos 5420 processor, which consists of four ARM Cortex-A15 cores clocked at 1.9GHz and four Cortex-A7 cores clocked at 1.3GHz in a big.LITTLE configuration, plus a Mali-T628 6-core GPU, while the LTE variant uses a Snapragon 800 processor, which consists of four Krait 400 cores clocked at 2.3GHz, plus an Adreno 330 GPU. The tablet has an 8 MP rear camera with LED flash and a 2 MP front camera. It's powered by a huge 9,500 mAh battery, which should sustain the large, high-res screen and the powerful SoC for long periods of usage. Expect this tablet to be very expensive, maybe even a bit below Surface Pro 2 territory. 

The Galaxy TabPro 12.2 is identical to the NotePro 12.2, though obviously sans the S-Pen stylus. Without the S-Pen, the TabPro 12.2 is actually a bit lighter, weighing 732g. Logically, it'll be slightly cheaper than the NotePro 12.2, though still well above the average tablet price. 

Galaxy TabPro 10.1

Much like the Galaxy TabPro 12.2 is a NotePro 12.2 sans S-Pen, the Galaxy TabPro 10.1 is essentially a Note 10.1 (2014) without the stylus. It's actually thinner and lighter than the Note 10.1 (2014), probably due to the exclusion of the S-Pen, measuring 7.3mm thick and weighing 469g for the Wi-Fi only version, and the LTE version weighs 477g, making it one of the few tablets to match the iPad Air in thickness (it's actually a bit thinner) and weight (they weigh EXACTLY the same). Compared to the Note 10.1, the TabPro 10.1 sees a reduction in RAM capacity from 3GB to 2GB. The reason for that reduction? I have no clue. Apart from that, they're practically the same, with a 10.1" 2560 x 1600 display with a 299ppi pixel density, an Exynos 5420 processor for the Wi-Fi version and Snapdragon 800 silicon for the LTE model, 8 MP rear camera with flash and a 2 MP front camera and a 8,220 mAh battery. Given its similarity to the Note 10.1 (2014), I'm assuming the exclusion of the S-Pen means the TabPro 10.1 will be a bit cheaper than its Note counterpart, I'm betting on $499.

Galaxy TabPro 8.4

Finally, there's the iPad mini 2 competitor, the Galaxy TabPro 8.4. It has, as the name suggests, an 8.4" display with 2560 x 1600 resolution, which gives the tablet an industry-leading 359ppi pixel density. Unlike other TabPro and NotePro tablets, both the Wi-Fi and LTE versions of this tablet are equipped with a Snapdragon 800 processor, an unusual decision from Samsung. The TabPro 8.4 also comes with an 8 MP rear camera with flash and a 2 MP front-facing camera. Like the TabPro 10.1, this tablet comes with "only" 2 GB of RAM. It's very thin and light, measuring 7.2mm thick and weighing 331g for Wi-Fi only, and 336g for the LTE version. The power hungry components are fed by a respectable 4,800 mAh battery. Expect the Galaxy TabPro 8.4 to be priced competitively with the iPad mini 2. Some may still prefer the iPad mini, but the TabPro 8.4 is definitely the best mini tablet in the Android space. 

Conclusion

All of the four tablets will come with Android 4.4 KitKat running out of the box. Samsung's  new Magazine UX will also make a debut with these tablets. Expect the TabPros and the NotePro 12.2 to be released in February, while pricing is still not known for certain. But so far we've heard that the NotePro 12.2 Wi-Fi only will be sold for about $800, the TabPro 10.1 will be $499 and the TabPro 8.4 will cost $399. Though not officially confirmed, these prices seem very plausible.

Samsung has started 2014 very well in the tablet space. The NotePro and TabPro tablets offer flagship specs, with the biggest difference between them (in the case of the TabPro line) being the screen size, much like what Apple did this year with the iPad Air and iPad Mini Retina. Expensive as they are, The Galaxy Pro tablets are bound to be the greatest Android tablets this year, if not the greatest tablets in general. 

quinta-feira, 16 de janeiro de 2014

CES 2014 - Sony Xperia Z1 Compact: Flagship Specs with a Smaller Display


There have been many complaints that recent Android phones with flagship hardware almost always meant a very large screen too, and that all smaller smartphones, save for the iPhone, were mid-range phones that were severely underspecced compared to their flagship counterparts, so there isn't really an option for who wants an Android smartphone with a smaller screen, with high-end specs. Sony will attempt to fill in that gap with its Xperia Z1 Compact smartphone. Unvieled at CES 2014, the Xperia Z1 Compact features almost identical specs to the 5" Xperia Z1 flagship, but in a much smaller 4.3" package.

Xperia Z1 Compact
 Body   127 x 65 x 9.5mm, 137g 
 Display   4.3" TFT Triluminos Display 1280 x 720 (342ppi) with X-Reality engine
 Connectivity   GSM (2G), HSDPA (3G), LTE (4G)
 Storage  16 GB (microSD expandable), 2 GB RAM
 Camera (Rear)   20.7 MP with Exmor RS image sensor, LED flash, face detection, image stabilization, HDR and 1080p video with video stabilization and HDR
 Camera (Front)  2 MP with 1080p video
 OS  Android 4.3 Jelly Bean
 Processor  Qualcomm Snapdragon 800 MSM8974 (Quad-core Krait 400 @ 2.2GHz + Adreno 330 @ 450MHz)
 Battery  2,300 mAh
 - 18 hours talk time
 - 670 hours standby
 - 12 hours video playback
 Notes  - IP58 certification (Waterproof and dust-proof)

Most of the Z1 Compact's spec list is unchanged from the original Z1, save for the display size and resolution, and of cours the dimensions. This is the first Android smartphone in recent history that we can really call a small-sized flagship. 

Design


Along with the rest of the Xperia Z1 Compact's specs, its design is very reminiscent of the larger Xperia Z1, but, you know, smaller. The Z1 Compact will be offered in various colors, including black, white, yellow and a very unusual pink.
The Z1 Compact isn't among the thinnest high-end smartphones around, actually it's 1mm thicker than the Xperia Z1. Still, considering it packs a pretty large battery and that 20.7 MP rear camera (without the camera protruding from the chassis) more than justifies the thickness, and it's not exactly thick at all.  It also weighs 137 grams, which is pretty heavy for its size, but then again, the large battery and the superb rear camera make the weight justice. 

The back of the device is made from a slightly glossy polycarbonate, just like the Xperia Z1 which doesn't look cheap at all. On the back cover there is only a centered Sony logo. On the bottom there's an Xperia logo, and on the top left corner is the 20.7 MP Exmor RS camera, and beside it is an LED flash. 

The front of the device is mostly clean, with the bottom bezel completely bare, and the top bezel accommodating the front-facing 2 MP camera and the ambient light and proximity sensors.

Overall, the Xperia Z1 Compact's design is superb. The white and black versions are very simple and understated, while the yellow and pink versions have a Lumia-esque quality to them. 

Display

Here's the only thing about the Z1 Compact that's really different from the Xperia Z1. The display size does down from a large 5" size to a more portable 4.3" size, and the resolution goes from 1080p to 720p. That means that the pixel density goes down from 441 in the Xperia Z1 to 342 in the Z1 Compact, but you'd have a very hard time trying to notice the difference in sharpness between the two smartphones. The 4.3" screen is still larger than the latest iPhone, but it's still much easier to handle than this year's 5" flagships. The Triluminos display technology used in the display helps it reproduce bright colors, and the X-Reality engine adds an extra pop to images and videos. For it's size, it's a very good display with no compromises. 

Processor and OS

The Xperia Z1 Compact, much like the Z1 and most recent flagships, is powered by a Qualcomm Snapdragon 800 chipset, currently one of the fastest SoCs available, if not the fastest. This SoC is built on a 28nm HPM process, and consists of four Krait 400 cores clocked at up to 2.2GHz plus a monstrous Adreno 330 GPU. Considering that the Adreno 330 already performs exquisitely at 1080p, I imagine that at 720p there would be nothing in the entire Play Store that can even utilize its full power. 

Conclusion

The Xperia Z1 Compact is expected to come out within the next few months. I expect its price to be lower than the Xperia Z1, but given its flagship specs the price may still be pretty high, maybe slightly below the flagship range, but definitely much above mid-range prices. 

I'm very happy to see Sony produce a flagship device with a relatively compact screen, during this age of ever larger flagships, and I hope other Android OEMs follow suit. With the Xperia Z1 Compact you get a flagship-grade processor, a very impressive camera that borrows from Sony's  successful digital camera technologies, and a large 2,300 mAh battery with a smaller display that makes for a very compact flagship. If you've been looking for a flagship Android smartphone, but never quite enjoyed the size of the usual flagships and wanted something that was more similar to the iPhone in size, the Xperia Z1 Compact is the best phone for you.

sexta-feira, 27 de dezembro de 2013

Samsung Galaxy Note 10.1 (2014 Edition) vs Microsoft Surface 2: Tablet Comparison


The holiday season is almost upon us, and so the biggest players in the tablet market finally have their latest flagships already available. The Surface 2, from Microsoft, and 
the Galaxy Note 10.1 2014 Edition, by Samsung, are some of the most interesting tablet 
flagships this holiday season. Both of them have very high-end specs, including high-resolution displays and powerful processors, along with a (perhaps too) high price tag. But which one is worth your money the most?

Galaxy Note 10.1 (2014 Edition) Microsoft Surface 2
 Body   243 x 171 x 7.9mm, 540g (Wi-Fi)/547g (LTE)   275 x 172.5 x 8.9mm, 676g 
 Display   10.1" TFT LCD 2560 x 1600 (299ppi)  10.6" ClearType 1920 x 1080 (208ppi)
 Connectivity   Wi-Fi, GSM (2G), HSDPA (3G), LTE (4G)  Wi-Fi
 Storage  16/32 GB, 3 GB RAM  32/64 GB, 2 GB RAM
 Camera (Rear)  8 MP with LED flash, Dual-camera, dual-recording and HDR and 1080p video  5 MP with LED flash and 1080p video
 Camera (Front)  2 MP with 1080p video  3.5 MP with 1080p video
 OS  Android 4.3 Jelly Bean  Windows 8.1 RT
 Processor  Wi-Fi: Exynos 5420 (Quad-core Cortex-A15 @ 1.9GHz + Quad-core Cortex-A7 @ 1.3GHz + Mali-T628 GPU)
 LTE: Qualcomm Snapdragon 800 MSM8974 (Quad-core Krait @ 2.3GHz + Adreno 330 GPU)
 NVIDIA Tegra 4 (Quad-core Cortex-A15 @ 1.7GHz + 72-core ULP GeForce)
 Battery  Non-removable 8,220 mAh
 Up to 10 hours of use
 Non-removable ~8,500 mAh (31.5 Wh)
 Up to 10 hours of use
 Accessories  - S Pen stylus  - Touch Cover 2 ($119)
 - Type Cover 2 ($129)
 - Power Cover ($199)
 Price  $549 (16 GB, Wi-Fi)  $449 (32 GB)


The two tablets, despite both being flagships, compete at different price points, which explains partially why the Surface 2's specs aren't as impressive as the Galaxy Note 10.1's.

Design

These two flagship tablets feature some very nice designs to go with the powerful hardware inside them and their high prices. In terms of materials the Surface 2 has the upper hand, because while the Galaxy Note 10.1 has a plastic back with a special texture that makes it look like leather (aka faux leather), the Surface 2's internals are protected by a durable magnesium alloy the Microsoft calls VaporMg. That gives the Surface 2 a premium look over the Note 10.1, and it's more durable too. The faux leather on the Note 10.1 might be appealing to some, but to others, including me, the leather imitation is not attractive. 

Despite its high-quality materials, the Surface 2 just falls short of its competitors when it comes to its size and weight. It's inevitably larger, since the screen is 1/2" larger than its Android rivals and is 0.9" larger than the iPad's screen, so we can't blame Microsoft for that. Not only that, but it's also thicker than most recent flagship tablets (the Galaxy Note 10.1 measures 7.9mm thick, and the iPad Air is 7.5mm thick) and much heavier, weighing 676g versus the Galaxy Note 10.1's 540g and the iPad Air's 469g. Of course some of that extra weight comes from the larger dimensions due to the larger screen, but that doesn't excuse the Surface 2 for being that heavy. It's still quite comfortable to hold, but the Galaxy Note 10.1 will definitely tire your arms less when holding the tablet for an extended period of time. The Surface 2 also has considerably larger bezels than its rivals. Considering the size of the screen, however, the bezel size is quite appreciable.

Of course, the Surface 2's built-in kickstand distinguishes it from all of its competitors. The new 2-stage kickstand is very useful, and is something you'd only be able to achieve on other tablets with covers like the iPad's Smart Cover, and considering the Surface 2's weight, you might find yourself using the kickstand more than you imagine. Also, one unique feature of the Surface 2 is its keyboard covers, which attach to the amazingly strong magnetic connector on the bottom side of the tablet and can also double as a cover for the screen. There are three options of keyboard covers, starting with the Touch Cover 2, which sells for $119 and this one features capacitive keys, which are now backlit, the Type Cover 2, which sells for $129, is thicker than the Touch Cover 2 with the benefit of having physical keys, which are also backlit. Finally there's the Power Cover, which will be available as of early 2014 for $199, and will be basically a Type Cover 2 with a built-in battery. Along with Microsoft Office RT 2013, the keyboard covers make the Surface 2 just about the most productive ARM tablet on the planet. 

The Galaxy Note 10.1 also has some productivity-oriented tricks up its sleeve with its S Pen digitizer, which comes included with the tablet and offers precise pen input for taking notes and other related tasks. 

Display

Of these two tablets, it's the Galaxy Note 10.1 2014 Edition that has the better display. While the display is smaller, measuring 10.1" diagonally, it packs much more pixels than the Surface 2, with a stunning 2560 x 1600 resolution and a top-notch 299ppi pixel density. Samsung's display also has excellent viewing angles and reproduces colors vibrantly and accurately. 

The Surface 2 packs a slightly larger 10.6" screen with a resolution of 1920 x 1080, resulting in a pixel density of 208ppi. Microsoft uses its so-called ClearType technology in the Surface 2, which means that the touch panel and the glass are laminated to the display, reducing reflections and thus making the tablet's screen more comfortable to use in direct light or outdoors. The display also has wide viewing angles, and like the Note 10.1 also reproduces accurate and saturated colors, although the Note 10.1 is still slightly more vivid. The difference in the two displays' pixel densities is quite easily noticeable when viewing text. The Note 10.1 is just completely devoid of any pixellation, while the Surface 2, while still very crisp, does show some pixellation in text if you look closely. 

The two displays have slightly different aspect ratios. While the Note 10.1 is 16:10, the Surface 2 is even wider with a 16:9 aspect ratio. So while the Note 10.1 is noticeably less wide, both screen share the same benefits and problems, for instance, they're excellent for watching videos, but while the Note 10.1 would show a very small amount of letterboxing, the Surface 2 should be devoid of any letterboxing. Both are also quite awkward to use in portrait mode, but the Note 10.1 is arguably a bit less awkward to use in portrait. In any case, both displays are excellent, but the Note 10.1 certainly outclasses the Surface 2 in every way, even if by a little. 

Processor

As flagship tablets, both of them are equipped with the latest and greatest silicon. The Surface 2 has a Tegra 4 processor, while the Galaxy Note 10.1 goes with a Snapdragon 800 beast for the LTE variant or Samsung's own Exynos 5420 processor for the Wi-Fi only version.

The Tegra 4 is NVIDIA's latest system-on-chip, and utilizes the 4-PLUS-1 architecture originally introduced in the Tegra 3, what that means is that there is one main CPU cluster, which is composed of four Cortex-A15 cores clocked at up to 1.9GHz with one core active (and 1.7GHz with more than one core active) and one additional shadow A15 core targeted for low frequency (up to ~825MHz) and low power consumption. When the CPU workload is very light, for example, when the device is idling, all processing transfers to the shadow core and the quad-core A15 cluster is power-gated, so that the shadow core can process these light tasks while consuming very low power, enhancing battery life. Performance-wise, the Cortex-A15 is one of the best performing mobile CPUs in existence, so CPU performance on the Surface 2 should be on par with the industry's greatest. 

The GPU in the Tegra 4 is a bit more disappointing. The shader architecture is the only one in the current mobile industry that is discrete rather than unified, and mind you, that's the architecture that most similarly resembles the Geforce 6000 series (which is very old indeed). Basically this means that, instead of each shader in the GPU being able to process pixel or vertex instructions based on the workload, there are separate pixel and vertex shader units. With a total of 72 shader cores (48 shader, 24 vertex) with a pretty high clock speed of 672MHz, the Tegra 4 actually packs a lot of processing power, despite its old architecture. As benchmarks will show, Tegra 4's GPU performance is somewhat behind the Snapdragon 800 and the Exynos 5420 processors used in the Galaxy Note 10.1, but considering that the Surface 2's GPU needs to push roughly half the amount of pixels compared to the Note 10.1, they're actually well-balanced performance-wise.

The Galaxy Note 10.1's Wi-Fi version is packed with an Exynos 5420 processor, more commonly known as Exynos 5 Octa. This processor uses ARM's big.LITTLE CPU architecture which, similarly to NVIDIA's 4-PLUS-1, has one high-performance CPU cluster and a second power-saving CPU cluster. The main cluster is very similar to the Tegra 4, containing four Cortex-A15 cores with a clock speed of 1.9GHz. Unlike the Tegra 4 though, which uses only one core in the power-saving cluster, Samsung went rather overkill and crammed in four low-power Cortex-A7 cores running at up to 1.3GHz. I'm not sure rather the Quad-core A7 @ 1.3GHz is more or less efficient in saving power than a single A15 @ 825MHz, but both solutions should have a similar effect on power consumption. In benchmarks, however, the Exynos 5420 is certainly very close to the Tegra 4, since their high-performing CPU clusters are practically identical. 

On the GPU side, the Exynos 5420 packs ARM's Mali-T628 GPU, which benchmarks prove to be a very powerful GPU and adequate for the Galaxy Note 10.1's high-resolution duties. Unlike the Tegra 4, the Mali-T628 is as modern as mobile GPUs go, as the shader architecture is unified and the GPU boasts full support of OpenGL ES 3.0.

The LTE Galaxy Note 10.1 is equipped with the industry leading Snapdragon 800 processor. This CPU in the Snapdragon 800 is a Quad-core configuration of Qualcomm's own Krait 400 CPU core, running at a max clock speed of 2.3GHz. The CPU is power-efficient enough so that an extra low-power CPU cluster isn't necessary here. In fact, one interesting ability of the Krait 400 core is that each core can run at a different clock speed depending on the workload put on each core, unlike the Cortex-A15, which has the same clock speed on all active cores. What's the advantage of that? For example, if the current workload requires two cores active, using one at full power but only processing light tasks on the second core, a Cortex-A15 CPU would put both cores on their highest clock speed, say, 1.9GHz, even though the second core is processing a light task and doesn't need the full 1.9GHz, while a Krait core, with the same workload, would put the first core on full power, in this case, 2.3GHz, and the second core at a lower clock speed adequate for its current task, say, 1.0GHz. This unique feature really helps increase power efficiency, and renders extra low-power CPU cores unnecessary. In terms of performance, its high clock speed and its strong core architecture make the Snapdragon 800 one of the fastest CPUs around, if not the fastest. 

The GPU in the Snapdragon 800 is the company's own Adreno 330. Since Qualcomm never discloses information about its GPU architectures, I'm left with very little to say about it, however, we do know that, like the Mali-T628, it has a modern architecture, with a unified shader architecture and full OpenGL ES 3.0 support. In general, the Adreno 330 does perform a bit better than the Mali-T628, but its performance is still pretty close to the Mali-T628. 

Now, with all that technical babble about architectures out of the way, let's get to actually testing these processors' performance in benchmarks, starting with Geekbench 3, which measures CPU and memory performance.

Note: The Galaxy Note 10.1's LTE edition isn't commercially available, so I had to take Snapdragon 800 benchmark results from the Note III, which runs the same software as the Note 10.1 and should therefore have almost identical results to the actual S800-powered Note 10.1. However, the difference in resolution (1080p vs 1600p) between the Note III and the Note 10.1 means I can't include onscreen GPU benchmark results for the Snapdragon 800.

Note (2): Unfortunately Geekbench 3 isn't available for Windows RT, so I can't include results for the Surface 2, so I took the performance results from an Android tablet whose processor most closely resembles the Surface 2's, the ASUS Transformer Pad TF701T, which is powered by a slightly higher-clocked Tegra 4.


The main current SoC flagships all have surprisingly similar CPU performance. The Tegra 4, Snapdragon 800 and Exynos 5420 offer very similar single-threaded performance, despite the architectural differences between the Krait 400 core and the Cortex-A15. The only clearly distinguished competitor here is the 64-bit Apple A7, but this is out of the scope of this comparison. When it comes to heavily-threaded tasks the Tegra 4 and the Exynos 5420 are practically identical (seeing as their CPUs ARE identical), along with the Apple A7, while the Snapdragon 800 takes the lead, though not by a big margin.

Evidently, the Galaxy Note 10.1's and the Surface 2's respective processors perform very similarly when it comes to CPU performance, so now let's check out some performance scores regarding the GPU performance with the popular cross-platform application, GFXBench. The two following tests are Offscreen test. That means that the GPU renders at a non-native, fixed 1080p resolution, so that differences between the devices' resolutions don't impact their performance.
In this test the Apple A7 takes the lead, followed closely by the Snapdragon 800. The Exynos 5420-toting Note 10.1 falls a bit behind, and the Tegra 4 in the Surface 2 receives a mediocre score compared to its competitors. Thankfully, the Surface 2 has less pixels to push than the Note 10.1, which will give it a performance advantage in the onscreen tests. 

In this test the Snapdragon 800 and the Exynos 5420 take the lead, with the A7 hot on its heels and the Tegra 4, again, yielding a rather mediocre score. 

Since the Note 10.1 has to push about a couple million pixels more than the Surface 2, it was the Tegra 4 that was faster in the Onscreen T-Rex HD test, but not by as much of a huge margin as two million less pixels would otherwise imply. In fact, I expect the Snapdragon 800-powered Note 10.1 will be able to match or even outperform the Surface 2 in this test, despite having twice the resolution. 

For the Egypt HD Onscreen test, not even the Surface 2's lower resolution helped it outperform the Note 10.1. Even with double the resolution, the Note 10.1 managed a much higher score than the Surface 2. In comparing the Surface 2's GPU performance to other Tegra 4 devices, I realized that the Surface 2 is in fact one of the worst performing Tegra 4 devices. That is probably because Microsoft chose one of the slower Tegra 4 SKUs for the Surface 2, and the CPU clock speed reduction from 1.9GHz to 1.7GHz might have come along with a GPU clock speed reduction from the full 672MHz, perhaps to 600MHz like on the 1.8GHz Tegra 4 in the Tegra Note tablet. At any rate, it's clear that the GPU performance in the Surface 2 isn't as good as the Galaxy Note 10.1

Power Consumption

From these two devices being compared, it's probably the Galaxy Note 10.1 that draws the most power. The first and most obvious cause is that it has much higher resolution screen to power. Also, while the SoC should be very power efficient due to its 28nm process (the Exynos 5420 is built on a 28nm High-K Metal Gate process, while the Snapdragon 800 uses a 28nm HPM process), but given the heavy duties that the GPU will be in charge of due to the high pixel count, it could become quite a power hog, especially when playing games. But the battery is very decently sized, which leads to Samsung's 10 hours of usage claim. 

The Surface 2 has, obviously, much less pixels to power, so the power consumption of the display is significantly lower. The Tegra 4 processor is also built on a 28nm process, so it won't get too hot or consume too much power when processing heavy tasks, like gaming. And while I can't compare the Surface 2's and the Galaxy Note 10.1's battery sizes directly, since Microsoft gives the battery size in watt-hours, and Samsung uses mAh, I can only compare them by estimating the Surface 2's capacity in mAh. Assuming that it's a 3.7V battery, the Surface 2 has around an 8,500 mAh capacity, which is actually slightly larger than the Samsung's 8,220 mAh battery. Then again, the battery voltage in the Surface 2 could easily not be 3.7V, which would lead to a different value altogether, but the safest bet (and that in itself isn't very safe) is 3.7V. Well, the extra thickness of the Surface 2 had to offer some advantage aside from the kickstand. Anyways, despite the lower display resolution and the (maybe) larger battery, Microsoft claims the same 10 hours of usage for the Surface 2, but in practice I'd expect the Surface 2 to outlast the Galaxy Note 10.1, even if only by a little. 

Pricing and Conclusion

Of course, the Surface 2's slightly weaker specs compared to the Galaxy Note 10.1 is justified by their different prices. The entry-level 32 GB Surface 2 sells for $449, while the 16 GB Wi-Fi only Galaxy Note 10.1 has a hefty $549 price tag. That's a $100 dollar difference for the same user-available storage capacity (as the Surface 2's OS leaves it only with about 17.5 GB of free disk space). The 64 GB Surface 2 (that has about 47 GB of free space initially) matches the 16 GB Note 10.1 at $549, while the 32 GB Note 10.1 will cost you $599. So clearly these tablets are competing at different price points. 

The Surface 2 is hands down the best tablet for productivity. With its handy two-stage kickstand and the new backlit Touch and Type covers, which act as much as keyboards as screen covers, as well as the Windows 8.1 RT operating system and the inclusion of Microsoft Office 2013 Home and Student make it by far the most productive tablet available. However, the relatively new Windows Store has many important apps available, but is still missing some key apps, like Instagram, and has nowhere near the amount of apps that the Google Play Store and the Apple App Store offer.

The Galaxy Note 10.1 2014 Edition is the polar opposite of the Surface 2. With a higher-resolution display and a very useful S-Pen stylus, as well as the vast app and media ecosystem offered by the Android OS and its associated app store, the Note 10.1 is up there with the iPad Air as one of the best tablets available for entertainment.

So it really comes down to whether you want a tablet that is geared towards productivity, i.e. a laptop replacement, or a tablet that offers the best for entertainment purposes. The difference in pricing is also a factor, as many will probably find the Galaxy Note 10.1 too expensive.

domingo, 24 de novembro de 2013

Apple iPad Air vs Samsung Galaxy Note 10.1 (2014 Edition): Tablet Comparison


The holiday season is almost upon us, and so the biggest players in the tablet market finally have their latest flagships already available. The iPad Air, from Apple, and the Galaxy Note 10.1 2014 Edition, by Samsung, are some of the most interesting tablet flagships this holiday season. Both of them have very high-end specs, including high-resolution displays and very powerful processors, along with a (perhaps too) high price tag. But which one is worth your money the most?

Apple iPad Air Samsung Galaxy Note 10.1 (2014)
 Body   240 x 169.5 x 7.5mm, 469g (Wi-Fi)/478g (LTE)  243 x 171 x 7.9mm, 540g (Wi-Fi)/547g (LTE)
 Display   9.7" IPS LCD 2048 x 1536 (264ppi)  10.1" TFT LCD 2560 x 1600 (299ppi)
 Storage   16/32/64 GB, 1 GB RAM  16/32 GB, 3 GB RAM
 Connectivity   Wi-Fi, GSM (2G), HSDPA (3G), LTE (4G)  Wi-Fi, GSM (2G), HSDPA (3G), LTE (4G)
 Camera (Rear)  5 MP with 1080p@30fps video, F/2.4 aperture, HDR, face detection  8 MP with LED flash, face detection and 1080p@60fps video
 Camera (Front)  1.2 MP with 720p@30fps video and face detection  2 MP with 1080p@30fps video
 OS  iOS 7  Android 4.3 Jelly Bean
 Processor  Apple A7 (Dual-core Cyclone @ 1.4GHz + PowerVR G6430 @ 450MHz) -Wi-Fi: Exynos 5420 (Quad-core Cortex-A15 @ 1.9GHz + Quad-core Cortex-A7 @ 1.3GHz + Mali-T628)
-LTE: Qualcomm Snapdragon 800 MSM8974 (Quad-core Krait 400 @ 2.3GHz + Adreno 330 @ 450MHz)
 Battery  Non-removable Li-Po 8,820 mAh
Video playback time: 10hrs
 Non-removable Li-Po 8,220 mAh
Video playback time: 10hrs
 Starting  Price  $499 (16GB, Wi-Fi)  $549 (16GB, Wi-Fi) 
 Accessories  --  S Pen


Design




Both Samsung and Apple have produced good designs for their flagship tablets, but it'll come down to the usual plastic vs aluminium debate, or in this case faux leather vs aluminium. While the iPad Air maintains its all-aluminium design, this time inspired on the iPad mini rather than the previous iPad, Samsung has done the same as it did with the Note III, replacing glossy plastic with a back casing that is still plastic, but is now disguised as leather. I'm not sure I appreciate the faux leather design at all. Personally, not only do I prefer the iPad's aluminium construction, but I think the faux leather looks so old-fashioned that even the glossy plastic they used previously may look better. That's just my opinion though, and ultimately it'll come down to personal taste. At least the faux leather gives the Galaxy Note 10.1 more grip than the iPad Air. The Galaxy Note 10.1 is available in black and white (bezel color included), and the iPad Air is similarly available in "Space" gray and silver. 

Both the Galaxy Note 10.1 and the iPad Air are remarkably thin and light. They are in fact one of the thinnest and lightest tablets available, but the iPad Air is definitely the winner in this department. It's technically thinner than the Note 10.1 (7.5mm vs 7.9mm), but the difference is so small it's practically unnoticeable to the user. While their thickness is one the same level, the iPad Air is significantly lighter than the Note 10.1 (469g vs 540g). In this case the difference in weight is definitely noticeable. The Note 10.1 is still lighter than most other tablets, though. 

Display

The display is possibly the area where these two tablets fare the best. Both are large, crisp, bright, and colorful. The iPad Air, much like two of its predecessors, has a 9.7" display with a 4:3 aspect ratio and a resolution of 2048 x 1536, which gives the screen 264ppi pixel density. The Note 10.1 has, like the name implies, a 10.1" display with a 16:10 aspect ratio that packs 2560 x 1600 pixels and has a pixel density of 299ppi.

Perhaps the most fundamental difference between the displays is the aspect ratio. The almost-square 4:3 display in the iPad Air makes it better to use in portrait mode, and is more suited for reading and web browsing, while the wide 16:10 display in the Note 10.1 makes it better suited for usage in landscape mode, and frankly makes portrait mode use a bit awkward, but is generally better for watching videos. 

You may think that the difference between 264ppi and 299ppi is huge, but honestly, it's hard to notice the Galaxy Note 10.1 being any crisper than the iPad Air, especially at the usual viewing distance. The difference is there, however, and any eagle-eyed person would probably notice a slight difference in sharpness. 

Leaving the numbers and quantitative data aside, both the Note 10.1's and the iPad Air's displays are sufficiently bright. Viewing angles are good, as is expected of any half-decent tablet these days, and colors are accurate and satisfyingly saturated in both tablets. 

Performance

Both of these tablets have the most powerful processors available to handle their ultra high-resolution duties. On the iPad Air we have the same A7 SoC found in the iPhone 5s and the Retina iPad mini, and on the Galaxy Note 10.1 we have either the Snapdragon 800 or a rare Exynos 5 Octa (5420) SoC for the LTE and Wi-FI models, respectively. All of these SoCs are built on 28nm process node to keep power consumption lower. 

The A7's CPU technology has gained quite a bit of popularity since its launch back in September. That's because its the first CPU to utilize the ARMv8 ISA, which happens to be a 64-bit architecture, hence also making it the first 64-bit mobile SoC. Apart from the new ISA, Apple made its new Cyclone CPU core the widest mobile CPU ever seen. With all that power packed into a single core, Apple needed no more than two of those cores with a relatively low 1.4GHz clock speed to match its competitors' performance. As benchmarks show, the dual-core Cyclone CPU @ 1.4GHz is perfectly capable of competing with the latest quad-core beasts, and since it packs much more power on a single core, the A7 really stands out from its competitors in single-threaded CPU benchmarks.

The CPU in the Exynos 5420 SoC in the Wi-Fi Galaxy Note 10.1 is one of the few CPUs to ultilize ARM's big.LITTLE technology. Based on the ARMv7 32-bit ISA, the Exynos 5420 contains two CPU clusters, one high-performance cluster to handle demanding tasks, and a low-power cluster for handling lighter tasks while reducing power consumption.The high-performance cluster contains four Cortex-A15 cores clocked at 1.9GHz, while the low-power cluster has four Cortex-A7 cores @ 1.3GHz. 

The Qualcomm Snapdragon 800 variant of the Galaxy Note 10.1 (the LTE version) has, like Apple, a custom CPU core dubbed Krait 400, based on the ARMv7 32-bit ISA. The Snapdragon 800 has four Krait 400 cores with an insane 2.3GHz clock speed. 




Like I said before, since the A7's Cyclone CPU has a 64-bit architecture and is wider than all of its competitors, it manages a much higher score in single-threaded CPU benchmarks. However, in multi-threaded applications the A7 has the disadvantage of having fewer cores compared to its competitors, however it can still definitely keep up with its quad-core competition. The multi-threaded test puts the A7 very close to the Exynos 5420, but both processors lag behind the Snapdragon 800.

With the CPU out of the way, let's focus on the GPU of the Galaxy Note 10.1 and the iPad Air. The A7 SoC follows Apple's tradition of licensing GPUs only from ImgTech, and so we have a PowerVR G6430 graphics processor in the A7. On the Wi-Fi Note 10.1's Exynos 5420 processor there's an ARM Mali-T628 GPU, and the LTE Note 10.1 has an Adreno 330 GPU. All of these GPUs are among the most powerful mobile GPUs available, so we turn to GFXBench to tell us which of these GPUs is the most powerful.
Note: Unfortunately there are no benchmark scores yet available for the Snapdragon 800-based Note 10.1, so I'm taking data from the closest match I could find, the Galaxy Note III with Snapdragon 800. However, I'll omit the Note III scores from the Onscreen tests due to the difference in resolution between the Note III and the Note 10.1.
The T-Rex HD Offscreen test shows the PowerVR G6430 in the iPad Air remarkably close to the Adreno 330, however the Mali-T628 GPU in the Wi-Fi Note 10.1 lags behind them both, but at least outperforms the NVIDIA Tegra 4 SoC in the ASUS Transformer Pad.

The lighter Egypt HD Offscreen test shows the iPad Air's GPU falling behing both the Wi-Fi Galaxy Note 10.1 and the Snapdragon 800-powered Galaxy Note III and puts the Snapdragon 800 at the top of the chart.

Note that since these two tests are rendered at a fixed, non-native resolution, the difference between the resolution of the Note 10.1 and the iPad Air don't affect the scores here. 



The Onscreen tests illustrate how the 1 million more pixels that these two Android flagships have to push versus the iPad Air bog down their performance. The T-Rex HD test shows that the iPad Air managed a much higher score compared to the Exynos-based Galaxy Note 10.1 and the Tegra 4 ASUS Transformer Pad TF701T. 

Since the Egypt HD test is much lighter than T-Rex HD the margin between the iPad Air and its competitors becomes narrower. However, it's still clear that the iPad Air, due to its significantly lower resolution, can push more frames than its 1600p Android competitors. 

Until the Snapdragon 800-based LTE Galaxy Note 10.1 gets released there's no data to indicate how it compares to the iPad Air in the Onscreen tests, although if I were to guess, I'd say that, even though the Adreno 330 is slightly more powerful than the PowerVR G6430 in the Apple A7, its performance advantage still won't be able to offset the resolution difference between it and the iPad Air.

Usually, the Onscreen tests would mimic most accurately real world gaming performance, given that Android and iOS games tend to run at the device's native screen resolution, but since the iPad 3 developers have been going another way: For specific ultra high-res devices, in order to avoid performance issues, the game runs at a lower-than-native resolution and then upscales to the device's screen resolution.  For example, a developer might program a game to run at 1920 x 1200 and then scale to 2560 x 1600 on the Galaxy Note 10.1 to keep framerates high. Given how the Galaxy Note 10.1's higher resolution obviously puts it behind its iPad competitor, it might be necessary for this sort of optimization to be made to keep a decent framerate in very demanding 3D games.

Conclusion

The Galaxy Note 10.1 and the iPad Air are in fact similar in many ways. They both have thin, light designs (although the plastic vs metal war continues with these flagships), displays with a very high resolution, large batteries and some of the best-performing SoCs available. 

In hardware terms, the iPad Air and the Galaxy Note 10.1 2014 Edition are indeed very similar, so it'll probably come down to software to determine which one is best for you. With the Note 10.1, we have Android 4.3 (and soon enough 4.4) with Samsung's TouchWiz UI added on top, and the iPad Air obviously runs iOS 7. 

The addition of the S Pen digitizer might make you choose the Note 10.1 over the iPad Air, but that'll be only if you really value the advantages that a stylus brings.

Selling for the usual $499 for the 16GB Wi-Fi version, the iPad Air is an expensive tablet, although not as expensive as the Galaxy Note 10.1, which sells for $549 for the 16GB Wi-Fi version. $549 is asking for a lot, so unless the S Pen is really useful for you or you really prefer the Android ecosystem, the iPad Air offers more bang for your buck than the Galaxy Note 10.1 2014 Edition.

sábado, 16 de novembro de 2013

Apple A7 vs NVIDIA Tegra 4 vs Snapdragon 800: SoC Wars


Mobile SoC performance has become one of the most competitive aspects in the mobile sector. Since 2010, when the iPad made it clear how important processing power is for mobile devices, performance in mobile devices has had exponential growth, and SoC vendors began to compete more and more. In 2013, the main SoC manufacturers can be narrowed down to Qualcomm, Apple, NVIDIA, and to a lesser extent, Samsung. TI used to be a big player in the SoC market, but this year it practically disappeared from the SoC sector. Now that these companies have their latest silicon shipping in commercially available products, in time for the holiday season, it's time to put their best offerings to the test and see who has the best offering.

Apple A7 NVIDIA Tegra 4 Snapdragon 800
 Process Node   28nm HKMG   28nm HPL  28nm HPM
 Die Size  102mm2  ~80mm2 118.3mm2
 Instruction Set   ARMv8 (64-bit)   ARMv7 (32-bit)   ARMv7 (32-bit)
 CPU  Dual-core Cyclone @ 1.3/1.4GHz   Quad-core Cortex-A15 @ 1.9GHz + Low Power Cortex-A15 @ 825MHz  Quad-core Krait 400 @ 2.3GHz
 GPU  PowerVR G6430 @ 450MHz  72-core ULP GeForce @ 672MHz  Adreno 330 @ max 550MHz
 RAM  32-bit Dual-channel LPDDR3-1600 (12.8GB/s)  32-bit Dual-channel LPDDR3/DDR3L-1866 (14.9GB/s)  32-bit Dual-channel LPDDR3-1866 (14.9GB/s)



The CPU: Dual-core vs Quad-core

Apple's most impressive feat on the mobile performance sector so far is that, in an age of quad-cores with insane clock speeds, Apple has not once shipped a device with more than two CPU cores and with a relatively low clock speed, and has still managed to at least keep up with the latest competition. Let's see how Apple's latest CPU, the dual-core Cyclone with a max clock speed of 1.4GHz, stacks up against NVIDIA's latest offering, the Tegra 4's four Cortex-A15s @ 1.9GHz and the Snapdragon 800's four Krait 400 cores @ 2.3GHz

Architecturally speaking, Apple's CPU is far superior to the Cortex-A15 and the Krait 400. That's because the A7 CPU runs on a brand new 64-bit ARMv8 architecture. The luxury of 64-bit allows the Cyclone CPU to be able to address memory much faster, giving it a tangible performance gain in some cases over traditional 32-bit solutions. Not only that, but Apple has made the Cyclone core much wider than its predecessor, the Swift core. In fact, I think it's the widest mobile CPU so far. The wider architecture plus 64-bit give the Cyclone cores much better single-threaded performance over any of its competitors, and remember that in most use cases single-threaded performance is the most important. Kudos to Apple for competing against monstrous quad-cores with only a dual-core. 

The NVIDIA Tegra 4's CPU uses NVIDIA's Variable Symmetric Multi-Processing architecture, which was introduced with the Tegra 3. Like ARM's big.LITTLE architecture, the Tegra 4 consists of a main CPU cluster, composed of four high-performance Cortex-A15 cores running at a max 1.9GHz, and a shadow A15 core than can go up to 825MHz. When CPU demand is low, the Quad-core A15 cluster is power-gated, and all processing transfers to the shadow A15 core, and it remains like this as long as demand from the CPU is low enough. The advantage of this is, of course, reduced power consumption.

Qualcomm's Snapdragon 800 uses Qualcomm's own modification of the Cortex-A15 core, dubbed Krait 400. Since Qualcomm likes to keep its mouth shut about its CPU architectures, not much is known about the Krait 400. What we know is that the Krait 400 is mostly the Krait 300 core in a 28nm HPm process. However, the move from 28nm LP in the Krait 300 and 28nm HPm in the Krait 400 means that there's been some relayout in the Krait 400. Other differences from Krait 300 include lower memory latency. Apart from that, we only know that, like the Cortex-A15 upon which it's based on, the Krait 400 is a 3-wide machine with OoO (Out-of-Order) processing capabilities. The move to HPm means the Krait 400 can achieve higher clocks than its predecessor, which accounts for the insane 2.3GHz max clock speed. Put that four of those monster cores together and you potentially have the most powerful mobile CPU to date. Unfortunately, it still remains that it also lags behind the Apple A7 in single-threaded performance, which is also very important in mobile OSes. 

Now let's put in some quantitative information to see how these CPUs compare in their actual performance: 

What I said before about single-threaded performance shows here. Apple's Cyclone cores can deliver at least 50% more performance on a single core than any of its competitors. But due to the fact that the A7 has only two cores while all of its main competitors have four of them, in multi-threaded situations the A7 loses its advantage, but can still keep up with all of its competitors. It's very impressive how Apple always manages to match quad-core performance with only two cores. 

The GPU and Memory

Apple has always put more emphasis on the GPU rather than the CPU on its SoCs, and the A7 is no different. Apple continues to license GPUs from Imagination Technologies, like it has been doing since its first iPhone. This time around, Apple is using a PowerVR "Rogue" series GPU, which is based on ImgTech's latest technology and, of course, supports OpenGL ES 3.0. The exact model of the new PowerVR GPU in the A7 is the G6430 variant, which contains four GPU modules with 32 unified shader units on each module. That equates to a total of 128 shader units with at a clock speed of 450MHz. 

Ironically, the NVIDIA Tegra 4's GPU is the least fancy of the current high-end mobile GPUs. Designed by NVIDIA, the GPU in the Tegra 4 is based on the ancient NV40 architecture (the same used in the GeForce 6000 series), hence, its the only modern GPU that uses discrete pixel and vertex shaders. In this case, there are a total of 72 shader units, 48 of which are pixel shaders and the remaining 24 are vertex shaders. The GPU runs on a max clock speed of 672MHz. The biggest limitation of the Tegra 4's GeForce GPU is that it only supports OpenGL ES 2.0. Right now, this isn't really a problem, as game developers haven't yet migrated to OpenGL ES 3.0 for their games, but that practically destroys the future-proofing of the Tegra 4.

Finally, we have the Snapdragon 800 with its Adreno 330 GPU. Like I said before, Qualcomm likes to reveal as little information as possible about its SoCs, and the Adreno line of GPUs are probably the biggest mysteries I'm faced with now. All I can say is that it's a unified shader architecture compatible with the latest OpenGL ES 3.0 API. The Adreno 330, in its highest configuration, runs at 550MHz, but the vast majority of Snapdragon 800 devices have their GPUs clocked at 450MHz. By the way, the benchmark results I'll show later on reflect the Adreno 330's performance at 450MHz, since no devices have released yet with the 550MHz bin of the Adreno 330. 

Snapdragon 800 Apple A7 NVIDIA Tegra 4 NVIDIA Tegra 4i
 GPU Name   Adreno 330  PowerVR G6430   72-core GeForce  72-core GeForce
 Shader Cores
 ?
 4  4 Pixel; 6 Vertex  2 Pixel; 3 Vertex 
 ALUs/Core
 ?
 32  12 Pixel; 4 Vertex  24 Pixel; 4 Vertex
 Total ALUs
 ?
 128  72 (48 Pixel, 24 Vertex)  60 (48 Pixel; 12 Vertex)
 Max Clock Speed  550MHz  450MHz  672MHz  660MHz
 Peak GFLOPS
 ?
 115.2  96.8  79.2


Peak theoretical compute power puts the Tegra 4 behind the A7, but the Tegra 4 is still close enough to the A7 to call it competitive. However, be aware that, while the A7's unified shader architecture allows it to have its peak 115.2 GFLOPS performance available to it in any situation (the same applies to the Adreno 330), the story is quite different with the Tegra 4. The discrete pixel shader architecture means that the GPU's peak 96.8 GFLOPS can only be achieved when the mix of pixel and vertex shader requests matches the ratio between pixel and vertex shader hardware (2:1), so most of the time the GPU achieves less than 96.8 GFLOPS.

There may not be a huge gap in theoretical compute between the A7's and Tegra 4's GPU, but the architectural difference is astounding. You can hardly put a unified shader architecture that supports OpenGL ES 3.0 in the same league as a discrete pixel and vertex shader architecture that is limited to OpenGL ES 2.0. While these differences may not affect real-world performance, the omission of OpenGL ES 3.0 is bad for future-proofing. 

Interestingly, every current high-end SoC uses pretty much the same memory interface. The Tegra 4, Apple A7 and Snapdragon 800 have dual-channel DDR3L solution, except that the Tegra 4 and the Snapdragon 800 allow for a slightly higher clock speed (933MHz) versus the A7 (800MHz), giving the A7 12.8 GB/s peak theoretical memory bandwidth, versus 14.9 GB/s on the Tegra 4 and Snapdragon 800. While the A7 has technically less theoretical memory bandwidth than its competitors, it counteracts this with a very interesting solution. It turns out the A7 has 4 MB of SRAM on-die, acting as a L3 cache, which can be used to unload instructions off the main memory interface and hence increase the bandwidth. You may recall that a similar solution is used in the Xbox One's SoC to increase memory bandwidth. 

Considering the 4MB SRAM on the A7's die, it may turn out that the A7 can deliver significantly more memory bandwidth than the Tegra 4, but still, both have enough memory bandwidth to power ultra high-resolution (>1080p) tablets comfortably. 

The T-Rex HD test shows the Tegra 4 significantly behind the Apple A7 and also puts it as the slowest of the high-end mobile GPUs. The Apple A7, however, is only beaten by the Snapdragon 800, however only by a very small margin. 

The less intensive Egypt HD test also shows the Tegra 4 behind the A7 and other high-end mobile SoCs, but by a smaller margin. The A7 is the second slowest of these SoCs in this test, achieving slightly lower scores than the Mali-T628 in the Exynos 5420 and the Adreno 330 in the Snapdragon 800. Both tests show the Snapdragon 800 as the supreme mobile GPU.
ImgTech GPUs have always had industry leading fill rate capabilities, and it shows in the A7. The PowerVR G6430 GPU has a much higher fill rate than any of its competitors. On the ther end of the spectrum, we have the Tegra 4. Tegra GPUs have a tendency of being substandard in terms of fill rate, and it shows. The Tegra 4 manages a significantly lower fill rate score than every one of its competitors, especially the Apple A7. That's a problem, because the Tegra 4 is currently used to power some of the few tablets which boast 1600p displays, for example, the ASUS Transformer Pad TF701T. On devices with 1080p screens or less however, even the Tegra 4 probably won't run into any bottlenecking due to the limited fill rate. The Snapdragon 800 also doesn't do very well, as it's also outperformed by the Mali-T628 in the Exynos 5420.



Here, the Tegra 4 and the Apple A7 are in the lead, with the Apple A7 pulling ahead slightly.



Adding lighting per vertex for some reason causes the Apple A7 to lag behind all of its competitors, leaving the Tegra 4 on the lead.


When using per pixel lighting, the A7 once again falls behind everyone else, and this time the Tegra 4 also joins it with the second lowest score.

Even though in some cases the Apple A7 lags behind its competition severely, I highly doubt this is going to make performance suffer in any way, since most mobile games aren't very geometry bound. 

The Snapdragon 800, while not at the top spot in most of these tests, shows strong scores across the board, outperforming the whole competition by a significant margin in the fragment lit test. 

Power Consumption

All of the current high-end SoCs should have low enough power consumption, since they all use 28nm silicon. On the CPU side, the A7 enjoys a low core count as well as a low clock speed, so I don't expect the CPU to draw too much power. The Tegra 4, on the other side, has four power-hungry Cortex-A15 cores with a much higher clock speed, however, the shadow A15 core has potential to counteract the extra power consumed when the main A15 cluster is active. The S800 doesn't have any extra low power cores, and relies on the efficiency of the main Krait 400 cores to yield good battery life. But given Qualcomm's record of making CPUs with low idle power, this is definitely not a problem.

One optimization that Qualcomm makes to reduce power consumption is that it can have different clock speeds on each active core. The competitors' architectures only allow them to run every active core at the same clock speed, even if unnecessary. So, for example, if there are two cores active, one of them fully loaded and the other running a much lighter task, the Krait 400 will have the first core on its max clock speed, while the second core could have a much lower clock, while its competing CPUs will run both cores at the max clock speed, even if the second core doesn't really need it. This is one of the many optimizations that make the Krait 400 core very power efficient. 

I can't really tell whether it's the 72-core GeForce GPU, the PowerVR G6430 or the Adreno 330 that consumes less power, but given ImgTech's record of making the most power efficient mobile GPUs, it's not a stretch to assume that the G6430 is the GPU that draws less power. 



Conclusion

While the Tegra 4, the Apple A7 and the Snapdragon 800 have completely different architectures, I'd say that they're pretty close to each other, based on the performance they've showed on synthetic benchmarks. The differences between the CPUs are the most astounding. While Apple focused on keeping core count and clock speed low while driving up single-core performance, NVIDIA's (or rather, ARM's) and Qualcomm's solution offsets the relatively lower single-threaded performance by using more cores at a higher clock speed. While the former is probably better for overall system performance, as mobile OSes tend to rely much more on single-threaded performance, the latter is probably better for multi-tasking. In any case, it's evident that all current high-end SoCs are surprisingly close together when it comes to peak multi-threaded performance.

Comparing the Tegra 4, Apple A7 and the Snapdragon 800 as well as the rest of the high-end competition, it's clear that the only one that is truly distinguished is the A7. The Tegra 4 and the Exynos 5420, for instance, both have four Cortex-A15 cores with a similar clock speeds (1.9GHz vs 1.8GHz, respectively), and they also have a separate CPU cluster for handling light tasks with low power (the Tegra 4 has a single A15 core at its disposal, while the Exynos 5420 uses a quad-core Cortex-A7 cluster for the same purpose). The Snapdragon 800 uses a unique architecture, the Krait 400, in a quad-core configuration and even takes the clock speed beyond the norm with an insane 2.3GHz, but unlike two of its competitors, it doesn't need extra low power cores, but has other solutions to keep idle power consumption low.

In GFXBench's high-level GPU benchmarks, it seems that all four main high-end SoCs are more or less on the same level, with only the Snapdragon 800 slightly pulling head of the A7. In both high-level tests, however, we can see the Tegra 4 lagging behind all of its competition. How ironic.

GFXBench's Low-level tests show a huge difference between the current high-end mobile GPUs, however. In the fill rate department we see the Apple A7 blowing all of its competitors out of the water, and we also see the Tegra 4 on the bottom of the chart and the Snapdragon 800 slightly ahead of the Tegra 4, but still behind the Exynos 5420 and the Apple A7.

The verdict of this comparison is that, while pretty much all of the current flagship SoCs are pretty close in terms of CPU power, the Tegra 4 falters slightly when the GPU is put to the test. The Apple A7 does very well on the GPU side, but it's just slightly outperformed by the Adreno 330 GPU on the Snapdragon 800. But really, they're all so close it's hard to pick one as a definite winner. You could call the Snapdragon 800 the overall inner, but I say it's too close to call.