Cortex A15: GPU Power Consumption - 3D Gaming Workload

ARM's Mali-T604 GPU is pretty quick, but similar to ARM's Cortex A15s it can definitely use a considerable amount of power to deliver that performance. Peak GPU power consumption tops out at just under 4W compared to ~1W for Qualcomm's Adreno 225. Even the Cortex A15s pull a decent amount of power in this test compared to the alternatives. It seems like that 4W max we keep seeing is likely the typical TDP for the Exynos 5250, anywhere from 1x - 4x what we get with Atom Z2760 and APQ8060A.

Task Energy - 3D Game 1 - Total Platform

Task Energy - 3D Game 1 - CPU Only

Task Energy - 3D Game 1 - GPU Only

The Mali-T604's performance advantage here comes at a price: total energy consumed is far higher than any of the competing solutions.

GPU Power Consumption - Max, Avg, Min Power

Max Power Draw - 3D Game 1 - Total Platform

Max Power Draw - 3D Game 1 - GPU Only

Max Power Draw - 3D Game 1 - CPU Only

Average Power Draw

Average Power Draw - 3D Game 1 - Total Platform

Average Power Draw - 3D Game 1 - GPU Only

Average Power Draw - 3D Game 1 - CPU Only

Minimum Power Draw

Min Power Draw - 3D Game 1 - Total Platform

Min Power Draw - 3D Game 1 - GPU Only

Min Power Draw - 3D Game 1 - CPU Only

Cortex A15: WebXPRT 2013 - Community Preview 1 Determining the TDP of Exynos 5 Dual
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  • kumar0us - Friday, January 04, 2013 - link

    My point was that for a CPU benchmark say Sunspider, the code generated by x86 compilers would be better than ARM compilers.

    Could better compilers available for x86 platform be a (partial) reason for faster performance of intel. Or compilers for ARM platform are mature and fast enough that this angle could be discarded?
    Reply
  • iwod - Friday, January 04, 2013 - link

    Yes, not just compiler but general optimization in software on x86. Which is giving some advantage on Intel's side. However with the recent surge of ARM platform and software running on it my ( wild ) guess is that this is less then 5% in the best case scenario. And it is only the worst case, or individual cases like SunSpider not running fully well. Reply
  • jwcalla - Friday, January 04, 2013 - link

    Yes. And it was a breath of fresh air to see Anand mention that in the article.

    Look at, e.g., the difference in SunSpider benchmarks between the iPad and Nexus 10. Completely different compilers and completely different software. As the SunSpider website indicates, the benchmark is designed to compare browsers on the same system, not across different systems.
    Reply
  • monstercameron - Friday, January 04, 2013 - link

    it would be interesting to throw an amd system into the benchmarking, maybe the current z-01 or the upcoming z-60... Reply
  • silverblue - Friday, January 04, 2013 - link

    AMD has thrown a hefty GPU on die, which, coupled with the 40nm process, isn't going to help with power consumption whatsoever. The FCH is also separate as opposed to being on-die, and AMD tablets seem to be thicker than the competition.

    AMD really needs Jaguar and its derivatives and now. A dual core model with a simple 40-shader GPU might be a competitive part, though I'm always hearing about the top-end models which really aren't aimed at this market. Perhaps AMD will use some common sense and go for small, volume parts over the larger, higher performance offerings, and actually get themselves into this market.
    Reply
  • BenSkywalker - Friday, January 04, 2013 - link

    There is an AMD design in their, Qualcomm's part.

    A D R E N O
    R A D E O N

    Not a coincidence, Qualcomm bought AMD's ultra portable division off from them for $65 million a few years back.

    Anand- If this is supposed to be a CPU comparison, why go overboard with the terrible browser benchmarks? Based on numbers you have provided, Tegra 3 as a generic example is 100% faster under Android then WinRT depending on the bench you are running. If this was an article about how the OSs handle power tasks I would say that is reasonable, but given that you are presenting this as a processor architecture article I would think that you would want to use the OS that works best with each platform.
    Reply
  • powerarmour - Friday, January 04, 2013 - link

    Agreed, those browser benchmarks seem a pretty poor way to test general CPU performance, in fact browser benchmarks in general just test how optimized a particular browser is on a particular OS mainly.

    In fact I can beat most of those results with a lowly dual-A9 Galaxy Nexus smartphone running Android 4.2.1!
    Reply
  • Pino - Friday, January 04, 2013 - link

    I remember AMD having a dual core APU (Ontario) with a 9W TDP, on a 40nm process, back in 2010.

    They should invest on a SOC
    Reply
  • kyuu - Friday, January 04, 2013 - link

    That's what Temash is going to be. They just need to get it on the market and into products sooner rather than later. Reply
  • jemima puddle-duck - Friday, January 04, 2013 - link

    Impressive though all this engineering is, in the real world what is the unique selling point for this? Normal people (not solipsistic geeks) don't care what's inside their phone, and the promise of their new phone being slighty faster than another phone is irrelevant. And for manufacturers, why ditch decades of ARM knowledge to lock yourself into one supplier. The only differentiator is cost, and I don't see Intel undercutting ARM any time soon.

    The only metric that matters is whether normal human beings get any value from it. This just seems like (indirect) marketing by Intel for a chip that has no raison d'etre. I'm hearing lots of "What" here, but no "Why". This is the analysis I'm interested in.

    All that said, great article :)
    Reply

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