SunSpider 0.9.1

Now the fun stuff. Doing power profiles of our standard benchmarks gives us good insight into how well each vendor was able to balance peak performance and average power. In general it's ok to burn more power for a short amount of time as long as it means you'll get to sleep quicker. This was one of the fundamentals of the first transition to mobile from the early 2000s.

 

We already know that Intel completes SunSpider quicker thanks to its improved memory subsystem over the Cortex A9, but it also does so with much better average power (3.70W vs. 4.77W for this chart). A big part of the average power savings comes courtesy of what happens at the very tail end of this graph where the W510 is able to race to sleep quicker, and thus saves a good deal of power.

JavaScript Performance
Time in ms (Lower is Better) Kraken SunSpider RIA Bench Focus
Acer W510 (Atom Z2760 1.8GHz) 33220.9ms 730.8ms 3959ms
Microsoft Surface (Tegra 3 1.3GHz) 49595.5ms 981.1ms 5880ms
Samsung ATIV Smart PC (Atom Z2760 1.8GHz) 33406.0ms 721.3ms 3752ms
Apple iPad 4 (A6X) 19086.9ms 834.7ms -
Google Nexus 10 (Exynos 5 Dual) 11146.0ms 1384.1ms -

I also used SunSpider as an opportunity to validate the results from Intel's tablets with my own review samples. To generate this chart I measured power, every second, at the wall with both devices plugged in and with a fully charged battery. The resulting power consumption numbers include the efficiency loss at the AC adapter but the general curve shoud mimic the results above:

Note that the results do generally line up, although measuring at the battery gives more accurate results for the device and using the NI DAQ I was able to get better granularity on the power measurements.

Looking at CPU level power consumption we see a very even match between Atom and Tegra 3. Intel's advantage really comes from being able to complete the workload quicker (0.52W compared to 0.72W on average).

Once again we see a pretty significant difference in power consumption on the GPU rail between these two platforms.

Kraken

Mozilla's Kraken benchmark is a new addition to our js performance suite, and it's a beast. The test runs for much longer than SunSpider, but largely tells a similar story:

RIABench

RIABench's Focus Tests are on the other end of the spectrum, and take a matter of seconds to complete. What we get in turn is a more granular look at power consumption:

 

OS & App Launch Power WebXPRT & TouchXPRT
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  • vvv - Wednesday, January 2, 2013 - link

    Idle power comparisons on a sample size of one should not count. You would think that binning makes all samples look alike but you will be surprised. Reply
  • Wolfpup - Thursday, January 3, 2013 - link

    This is just so impressive...since at least the late 90's I've been wanting exactly this-an actual x86 PC in a mobile form factor. And...it's actually here.

    Heck, this Atom could go in today's CELL phones no problem (the bigger, higher end ones anyway). It's better than Vita's CPU (although granted, wasn't available at the time).

    An actual tablet that can be SMALLER than ARM tablets even, real Windows, real x86...same price. Soooo impressive!

    Granted the hardware will keep getting better and the software kinks will get worked out, but...it's actually happening!
    Reply
  • shriganesh - Saturday, February 9, 2013 - link

    Very nice comparison! x86 does seem to be very power efficient! Except the Tegra 3's companion core isn't working. Compare an x86 Android tablet/phone with ARM tablet/phone. That will be more of an apple to apple comparison.

    All the guys rooting for Intel. Beware! Intel crushed AMD with Core CPUs. But when AMD lost the battle, there were no more moderately priced intel CPUs! Intel is like Apple! They always charge a premium.

    I hope Intel looses to the armada of ARM CPU designers (Samsung, nVidia, Quailcomm) just for the sake of cheap CPUs. With the world heading towards internet of everything, the last thing we need is COSTLY intel CPUs!
    Reply

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