The Great Equalizer: Apple, Android & Windows Tablet GPUs Compared using GL/DXBenchmark 2.7by Anand Lal Shimpi on March 31, 2013 11:58 PM EST
For the past few years we have been lamenting the state of benchmarks for mobile platforms. The constant refrain from those who had been around long enough to remember when all PC benchmarks were terrible was to wait for the release of Windows 8 and RT. The release of those two OSes would bring many of the traditional PC benchmark vendors space into the fray. While we're expecting to see new Android, iOS, Windows RT and Windows 8 benchmarks from Futuremark and Rightware, it's our old friends at Kishonti who are first out of the gate with a cross-OS/API/platform benchmark. GLBenchmark has existed on both Android and iOS for a while now, but we're finally able to share information and performance data using DXBenchmark - GLB's analogue for Windows RT/8.
As the name difference implies, DXBenchmark uses Microsoft's DirectX API while GLBenchmark relies on OpenGL ES. The API difference alone makes true cross-platform comparison difficult, especially since we're comparing across APIs, OSes and hardware - but we at least have the option to get a rough idea of how these platforms stack up to one another. There are a lot of improvements expected with Windows Blue later this year from a platform optimization standpoint from the ARM based SoC vendors, so I wouldn't read too much into any of the Android vs. Windows RT comparisons of the same hardware (even though some key results end up being very close).
While GLBenchmark 2.7 doesn't yet take advantage of OpenGL ES 3.0 (GLB 3.0 will deliver that), it does significantly update the tests to recalibrate performance given the advances in modern hardware. Version 2.7 ditches classic, keeps Egypt HD and adds a new test, T-Rex HD, featuring a dinosaur in pursuit of a girl on a dirt bike:
Scene complexity goes up tremendously with the T-Rex HD benchmark. GLBenchmark has historically been more computationally bound than limited by memory bandwidth. The transition to T-Rex HD as the new flagship test continues the trend. While we see scaling in average geometry complexity, depth complexity and average memory bandwidth requirements, it's really in the shader instruction count that we see the biggest increase in complexity:
|GL/DXBenchmark 2.7: T-Rex HD Compared to Egypt HD Benchmark|
|Increase in T-Rex HD|
|Average Geometry Complexity||+55%|
|Average Depth Complexity||+41%|
|Average Texture Memory Bandwidth Requirements||+41%|
|Average Shader Instruction Count||+165%|
T-Rex HD should benefit from added memory bandwidth, but increases in raw compute performance will be most visible. Given the comparatively static nature of memory bandwidth improvements, scaling shader instruction count to increase complexity makes sense.
Just as before, both GL and DXBenchmark 2.7 can run in onscreen (native resolution, v-sync enabled) and offscreen (1080p, v-sync disabled) modes.
The Android and iOS versions retain the UI of their predecessors, while DXBenchmark 2.7 introduces a Windows RT/8 flavored take on the UI:
There will be a unified database of scores across both GL and DXBenchmark once the latter gets enough submissions.
The low level tests are comparable between GLBenchmark 2.5 and 2.7, only results from the new T-Rex HD benchmark can't be compared to anything GLBenchmark 2.5 produced (for obvious reasons).
Now time for the exciting part. The usual suspects from the iOS and Android worlds are present, I didn't include anything slower than a Tegra 3 given how low T3 scores in the T-Rex HD test. From the Windows RT camp we've got Microsoft's Surface RT (Tegra 3) and Dell's XPS 10 (APQ8060A/Adreno 225). The sole 32-bit Windows 8 Pro representative is ASUS' VivoTab Smart (Atom Z2560/PowerVR SGX 545). Finally, running Windows 8 Pro (x64) we have Microsoft's Surface Pro (Core i5-3317U/HD 4000) and the Razer Edge (Core i7-3517U/GeForce GT 640M LE).
As always, we'll start with the low level results and move our way over to the scene tests:
Looking at the fill rate tests, we have the first indication of how Intel's HD 4000 graphics compares to the best in the tablet space. Unconstrained, Surface Pro delivers a fill rate of over 2x that of the 4th generation iPad. NVIDIA's GeForce GT 640M LE delivers nearly 3x the fill rate of the iPad 4.
The Mali-T604 in Google's Nexus 10 finds itself in between the iPad 4 and iPad mini, while Tegra 3 ends up faster than both the Clover Trail and Qualcomm Windows RT platforms. It's interesting to note the big difference in fill rate between the Nexus 7 (Android/Tegra 3) and Surface RT (Windows RT/Tegra 3). You would think that driver maturity would be better on Windows for NVIDIA, but assuming this isn't some big API difference it could very well be that Tegra 3 on Android is more mature.
The gap in geometry performance between Intel's HD 4000 and Imagination Tech's PowerVR SGX 554MP4 grows to over 2.5x. Surface RT and the Nexus 7 switch positions, and grow a lot closer than they were in the fill rate test. Qualcomm's Windows RT platform remains at the bottom of the list, and Intel's Clover Trail remains disappointing in the graphics department.
Increase the complexity of the triangle test and things don't change all too much.
Moving on to the scene tests, we have the first look at the current landscape of T-Rex HD performance on tablets. When Egypt HD first came out, the best SoCs were barely able to break 20 fps with the majority of platforms delivering less than 13 fps. In the 8 months since the release of GLBenchmark 2.5, the high end bar has moved up considerably. The best tablet SoCs can now deliver more than 40 fps in Egypt HD, with even the latest smartphone platforms hitting 30 fps. T-Rex HD hits the reset button, with the fastest ARM based SoCs topping out at 16 fps.
Looking at the offscreen results, we finally get what we came here for. Intel's HD 4000 manages to deliver 3x the performance of the PowerVR SGX 554MP4, obviously at a much higher power consumption level as well. The Ivy Bridge CPU used in Surface Pro carries a 17W TDP, and it's likely that the A6X used in the iPad 4 is somewhere south of 5W. The big question here is how quickly Intel can scale its power down vs. how quickly can the ARM guys scale their performance up. Claiming ARM (and its partners) can't build high performance hardware is just as inaccurate as saying that Intel can't build low power hardware. Both camps simply chose different optimization points on the power/performance curve, and both are presently working towards building what they don't have. The real debate isn't whether or not each side is capable of being faster or lower power, but which side will get there first, reliably and with a good business model.
To put these results in perspective, the GPU in the Xbox 360 still has around 3x the compute power of what's in the iPad 4. We're getting closer to having current (soon to be previous) gen console performance in our ultra mobile devices, but it'll take another year or two to get there in the really low power devices. Surface Pro is already there.
The rest of the players here aren't that interesting. Everything from the Tegra 3 to the old A5 in the iPad mini performs fairly similarly when faced with the same display resolution (1080p). Despite standings in some of the lower level benchmarks, Qualcomm's aging APQ8060A platform in the Dell XPS 10 (Windows RT) manages a healthy performance advantage over Intel's Atom Z2560 - both aren't particularly exciting parts from a graphics performance standpoint however. It's interesting to note just how close Surface RT and the Nexus 7 are here, given that they are running different OSes, using different APIs but powered by the same Tegra 3 SoC.
The only other scene test we have is Egypt HD, which is a known quantity these days. The only new bits are the inclusion of the Windows players using DXBenchmark:
Everyone's performance looks a lot better under the Egypt HD test, which is of course the motivation for creating the T-Rex HD test. Also interesting to note is the Apple/Intel gap shrinks a bit here, now the advantage is only 2x. It's important to put all of this in perspective. If your ultimate goal is to be able to run a shader heavy workload like T-Rex HD, then most of the tablet platforms have a long way to go. If Epic's Citadel demo release on Android is any indication however, there's a lot that can be done even with the mainstream level of performance available on smartphones and tablets today. Identifying and delivering the best performance at whatever that sweet spot may be is really the name of the game here, and it's one that the ARM folks have done a great job of playing.
I'm very curious to see how these graphs change over the next two years. I don't suspect Haswell will shift peak platform power down low enough to really be viewed as an alternative to something like an iPad, but with Broadwell (2014) and Skylake (2015) that may be a possibility. The fact that these charts are even as close as they are, spanning 7-inch tablets all the way up to full blown PC hardware, is an impressive statement on the impact of the mobile revolution.
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glockjs - Monday, April 1, 2013 - linkI want to see this same write up this time next year. Intel is coming up with some scary tech...also here's to hoping AMD wanders around again. This is just apples to oranges BUT it does show that there is gap worthy of being compared....this is a good thing :D
R0H1T - Monday, April 1, 2013 - linkSeeing as how the top of the line ARM build(iPad 4) is anywhere between 1.4~3x slower than Intel's HD 4000 whilst greatly saving on power, I'd wager that MS' decision to go alongwith AMD for their next iteration of Surface Pro was a sound one not to mention the fallacy/myth that ARM can't scale up fast enough is soon gonna melt away ! Now I've pretty much always bashed how folks at AT favor Intel over anything & everything else, however this graph should be proof enough that ARM/AMD are squeezing them much harder than what most would like to believe, not to mention the fact that their monopolistic position in traditional x86 market is what is keeping them afloat but with the near collapse of the desktop market up ahead they'll be scrambling for cover not unlike AMD |-:
tuxRoller - Monday, April 1, 2013 - linkIntel's graphics certainly pull more power than img, but they also deliver much better performance (especially in the fills/triangles/fragment/vertex). Their efficiency looks to be roughly of a kind. That's impressive considering Intel doesn't have to be as concerned with a constrained environment as img.
lmcd - Tuesday, April 2, 2013 - linkI disagree, IMG tech has pushed past the chips implemented here already, and by a lot. I see IMG tech really pushing the bar, particularly if they get their CPU side going.
It'd be interesting, if IMG tech sped up the process and put together their own SoC using their graphics and ARM C A15.
Speedfriend - Tuesday, April 2, 2013 - linkFrom what I remember reading, the first version of IMG's new series 6 will be as fast as the iPad4 (but with more features) with the most advanced versions in the future being 2-3x that, so about what the Surface Pro delivers now. By that time, Intel will be delivering 2-3x the current graphics performance. While there is no doubt that IMG is the leader in the smart-phone space, it does look like it will be lagging intel in the tablet space.
R0H1T - Tuesday, April 2, 2013 - linkWhere did you get that info, haswell GT3 anyone ?
Intel's IGP have been delivering incremental performance gains, unlike AMD/Nvidia on the dedicated GPU front, not to mention the old adage of moar cores has been their only saving grace thus far ! They've been constantly adding EU's on the CPU die without adding much to the actual CPU transistor count, one of the reasons the CPU gains have flattened since SNB, so nope they'll not deliver ~3x their current IGP performance anytime soon unless of course they double/treble the GPU on die area & drastically cripple the CPU side of things !
tuxRoller - Tuesday, April 2, 2013 - linkI'm not sure what you mean by "pushed past", since, to my knowledge, rogue hasn't been released yet so we don't know how they will really perform, and what they have released is not as fast as what intel has (though it is more efficient).
So, on average, intel is about two and quarter times faster than the 543mp4 while using up to three times the power, so intel is less efficient, but not as much as I'd anticipated.
damianrobertjones - Tuesday, April 2, 2013 - linkAll I see is Arm devices sitting there behind the HD4000 etc. I see nothing positive for Arm as the Atom based devices will soon catch-up and the HD 4600 move further away.
joos2000 - Tuesday, April 2, 2013 - linkInteresting indeed. However, ARM didn't develop the GPU cores in the iPad. PowerVR did. PowerVR are delivering the most powerful graphics core in the mobile space at the moment, but everyone else is closing in. It'll be interesting to see if we can get xbox 360 gpu performance in the current powerband within the next couple of years.
rexian96 - Monday, April 1, 2013 - linkI'd like to see the same benchmarks in another 3 - 6 months when we have Tegra 4 based tablets (Android / RT) in the market. If the rumor of Tegra 4 being much faster than all things ARM based today is true, it'll probably be the time for me to seriously consider a tablet (thin but powerful enough to work).