Yesterday Apple unveiled its third generation iPad, simply called the new iPad, at an event in San Francisco. The form factor remains mostly unchanged with a 9.7-inch display, however the new device is thicker at 9.4mm vs. 8.8mm for its predecessor. The added thickness was necessary to support the iPad's new 2048 x 1536 Retina Display.

Tablet Specification Comparison
  ASUS Transformer Pad Infinity Apple's new iPad (2012) Apple iPad 2
Dimensions 263 x 180.8 x 8.5mm 241.2 x 185.7 x 9.4mm 241.2 x 185.7 x 8.8mm
Display 10.1-inch 1920 x 1200 Super IPS+ 9.7-inch 2048 x 1536 IPS 9.7-inch 1024 x 768 IPS
Weight (WiFi) 586g 652g 601g
Weight (4G LTE) 586g 662g 601g
Processor (WiFi)

1.6GHz NVIDIA Tegra 3 T33 (4 x Cortex A9)

Apple A5X (2 x Cortex A9, PowerVR SGX 543MP4)

1GHz Apple A5 (2 x Cortex A9, PowerVR SGX543MP2)
Processor (4G LTE) 1.5GHz Qualcomm Snapdragon S4 MSM8960 (2 x Krait)

Apple A5X (2 x Cortex A9, PowerVR SGX 543MP4)

1GHz Apple A5 (2 x Cortex A9, PowerVR SGX543MP2)
Connectivity WiFi , Optional 4G LTE WiFi , Optional 4G LTE WiFi , Optional 3G
Memory 1GB 1GB 512MB
Storage 16GB - 64GB 16GB - 64GB 16GB
Battery 25Whr 42.5Whr 25Whr
Pricing $599 - $799 est $499 - $829 $399, $529

Driving the new display is Apple's A5X SoC. Apple hasn't been too specific about what's inside the A5X other than to say it features "quad-core graphics". Upon further prodding Apple did confirm that there are two CPU cores inside the SoC. It's safe to assume that there are still a pair of Cortex A9s in the A5X but now paired with a PowerVR SGX543MP4 instead of the 543MP2 used in the iPad 2. The chart below gives us an indication of the performance Apple expects to see from the A5X's GPU vs what's in the A5:

Apple ran the PowerVR SGX 543MP2 in its A5 SoC at around 250MHz, which puts it at 16 GFLOPS of peak theoretical compute horsepower. NVIDIA claims the GPU in Tegra 3 is clocked higher than Tegra 2, which was around 300MHz. In practice, Tegra 3 GPU clocks range from 333MHz on the low end for smartphones and reach as high as 500MHz on the high end for tablets. If we assume a 333MHz GPU clock in Tegra 3, that puts NVIDIA at roughly 8 GFLOPS, which rationalizes the 2x advantage Apple claims in the chart above. The real world performance gap isn't anywhere near that large of course - particularly if you run on a device with a ~500MHz GPU clock (12 GFLOPS):

GLBenchmark 2.1.1 - Egypt - Offscreen (720p)

GLBenchmark 2.1.1's Egypt offscreen test pegs the PowerVR SGX 543MP2 advantage at just over 30%, at least at 1280 x 720. Based on the raw FP numbers for a 500MHz Tegra 3 GPU vs. a 250MHz PowerVR SGX 543MP2, around a 30% performance advantage is what you'd expect from a mostly compute limited workload. It's possible that the gap could grow at higher resolutions or with a different workload. For example, look at the older GLBenchmark PRO results and you will see a 2x gap in graphics performance:

GLBenchmark 2.1.1 - PRO - Offscreen (720p)

For most real world gaming workloads I do believe that the A5 is faster than Tegra 3, but the advantage is unlikely to be 2x at non-retinadisplay resolutions. The same applies to the A5X vs. Tegra 3 comparison. I fully expect there to be a significant performance gap at the same resolution, but I doubt it is 4x in a game.

Mobile SoC GPU Comparison
  Apple A4 Apple A5 Apple A5X Tegra 3 (max) Tegra 3 (min) Intel Z2580
GPU PowerVR SGX 535 PowerVR SGX 543MP2 PowerVR SGX 543MP4 GeForce GeForce PowerVR SGX 544MP2
MADs per Clock 4 32 64 12 12 32
Clock Speed 250MHz 250MHz 250MHz 500MHz 333MHz 533MHz
Peak Compute 2.0 GFLOPS 16.0 GFLOPS 32.0 GFLOPS 12.0 GFLOPS 8.0 GFLOPS 34.1 GFLOPS

The A5X doubles GPU execution resources compared to the A5. Imagination Technologies' PowerVR SGX 543 is modular - you can expand by simply increasing "core" count. Apple tells us all we need to know about clock speed in the chart above: with 2x the execution resources and 2x the performance of the A5, Apple hasn't changed the GPU clock of the A5X.

Assuming perfect scaling, I'd expect around a 2x performance gain over Tegra 3 in GLBenchmark (Egypt) at 720p. Again, not 4x but at the same time, hardly insignificant. It can take multiple generations of GPUs to deliver that sort of a performance advantage at a similar price point. Granted Apple has no problems eating the cost of a larger, more expensive die, but that doesn't change the fact that the GPU advantage Apple will hold thanks to the A5X is generational.

I'd also point out that the theoretical GPU performance of the A5X is identical to what Intel is promising with its Atom Z2580 SoC. Apple arrives there with four SGX 543 cores, while Intel gets there with two SGX 544 cores running at ~2x the frequency (533MHz vs. 250MHz).

With the new iPad's Retina Display delivering 4x the pixels of the iPad 2, a 2x increase in GPU horsepower isn't enough to maintain performance. If you remember back to our iPad 2 review however, the PowerVR SGX 543MP2 used in it was largely overkill for the 1024 x 768 display. It's likely that a 4x increase in GPU horsepower wasn't necessary to deliver a similar experience on games. Also keep in mind that memory bandwidth limitations will keep many titles from running at the new iPad's native resolution. Remember that we need huge GPUs with 100s of GB/s of memory bandwidth to deliver a high frame rate on 3 - 4MP PC displays. I'd expect many games to render at lower resolutions and possibly scale up to fit the panel.

What About the Display?

Performance specs aside, the iPad's Retina Display does look amazing. The 1024 x 768 panel in the older models was simply getting long in the tooth and the Retina Display ensures Apple won't need to increase screen resolution for a very long time. Apple also increased color gamut by 44% with the panel, but the increase in resolution alone is worth the upgrade for anyone who spends a lot of time reading on their iPad. The photos below give you an idea of just how sharp text and graphics are on the new display compared to its predecessor (iPad 2, left vs. new iPad, right):

The improvement is dramatic in these macro shots but I do believe that it's just as significant in normal use. 

Apple continues to invest heavily in the aspects of its devices that users interact with the most frequently. Spending a significant amount of money on the display makes a lot of sense. Kudos to Apple for pushing the industry forward here. The only downside is supply of these greater-than-HD panels is apparently very limited as a result of Apple buying up most of the production from as many as three different panel vendors. It will be a while before we see Android tablets with comparable resolutions, although we will see 1920 x 1200 Android tablets shipping in this half.

The CPU & More
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  • solipsism - Sunday, March 11, 2012 - link

    Doesn't the 360 only output 720p? Reply
  • Steelbom - Sunday, March 11, 2012 - link

    It varies from 1024x600 to 1080p but the majority are 720p. (I'd imagine the few at 1080p would be less impressive graphically.) Reply
  • Ryan Smith - Monday, March 12, 2012 - link

    The 360 has 22.4GB/sec of main memory bandwidth (the eDRAM is even higher). That's 1.4GHz on a 128bit bus. The A5 meanwhile is 800MHz on a 64bit bus, which on paper is 6.4GB/sec. Reply
  • Steelbom - Tuesday, March 13, 2012 - link

    Ah right, I see. Thanks. Reply
  • tipoo - Wednesday, March 21, 2012 - link

    So 3.5X the bandwidth for far less resolution. I think what we're bound to see is games that advertise native retina resolution, but the textures and whatnot will still be the old resolution. Games like Infinity Blade have separate resolutions for menus, shadows, etc. Reply
  • thebeastie - Saturday, March 10, 2012 - link

    I am hoping to see you do some oversized bluray rip mkv benchmarks, I have my avatar 3d bluray mkv and the ipad2 just can't handle it via local or over network, very annoying if I want to watch a movie in the other room via my Sony HMZ-T1 via apple hdmi out connector.

    I want a tablet that can at least handle this kind of work load, it should be able to as it still fits into content consumption and nothing to do with content creation...

    Thanks, been a big anandtech fan for over 10 years!
    Reply
  • realbabilu - Sunday, March 11, 2012 - link

    Dear beastie, the idevices is supporting playing 1080p, even the iPhone 3GS can done it. How? The QuickTime plugin inside iOS is so powerful that can play that specs. However there is some caveat. You must using mp4 container that has x264 avc and mp4 AAC stereo format or 6ch AAC, rather than Mkv.

    I assume you have Mkv format of bdripped movie. Check that movie has x264 avc track, and AAC audio. Usually Mkv has ac3 sound track or stereo AAC like he AAC Nero codec has. Form here you can re mux or video copy the Mkv into mp4 container, the process only take 1 minute. Ac3 should be converted, but it takes no longer than 5 minutes.

    How to Re mux it? If you are using Mac, try subler, the best ever free Mp4 from Mkv for Mac, includes metadata like pros, and ac3 convert, also multi subtitle, and multi sound track. If you are in the pc, you can copy Remux thru free xmedia recode, and copy the AAC stereo or convert the ac3 to stereo AAC.unfortunately no subtitle muxer approved in ios of including mp4box srtiphone.

    If you want to retaining the ac3 you can put the ac3 to sound track 2 as pastry, and put the AAC stereo as soundtrack number 1. The editing multi soundtrack needs subler. Or if you have want to convert not Remux from DVD or blue ray you can use handbrake pc/ Mac that can convert video,multi sound, multi subtitle as subler did but takes hours since it converting instead Remux.

    The results 1080p can be opened directly using third party like oplayerhd with QuickTime plugin enabled. Or you can use videos iPad default app. To insert 1080p inside iPad movies library you have to use copytrans manager free that only availableo on pc. Be sure to have iPad manually manage songs enabled on iTunes desktop.

    http://www.youtube.com/watch?v=yRWOUcgdXvw
    Reply
  • ueharaf - Saturday, March 10, 2012 - link

    how about atrix and atrix 2 in with ubuntu?
    lapdocks,multimedia docks,etc.
    Android and linux has an alternative to windows 8...dont forget it!!
    Reply
  • wilmarkj - Sunday, March 11, 2012 - link

    This has got to be one of the best summaries i have read online about the whole tablet issue and its future. I am fedup of all those 'pundits' out there who are jumping on the "tablets are going to take over everything" bandwagon. I dont see how tablets in its current state could be used for writing documents, programming, graphics, serious gaming, spreadsheets, doing animations, etc or any 'real work' Its even questionable for casual things like gaming or even browsing the internet or writing an email. Once it involves text i would much prefer a system with a PROPER keyboard. However this has brought many casual users to the computing fray. And i agree with your sentiments with windows 8. I am wondering where we 'serious' users will get our next os from?? Reply
  • AnnonymousCoward - Sunday, March 11, 2012 - link

    Does The New Ipad still require you to perform the pointless "slide to unlock" and "slide to power down"? Dumbest requirement ever. Reply

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