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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  • yyrkoon - Tuesday, December 25, 2012 - link

    same OS, different HAL. Reply
  • Krysto - Monday, December 24, 2012 - link

    Good job comparing a last-gen chip like Tegra 3 with Intel's latest Atom chip, Anand. Just because Microsoft is too slow to adopt a cutting edge ARM chip for Windows, doesn't mean Intel is now "toe to toe" with ARM.

    Compare Nexus 10 and iPad 4 with Clover Trail in GPU performance and price, and then let me know how it went.
    Reply
  • croc - Monday, December 24, 2012 - link

    People that tend to use terms like 'fact' also seem to be such complete tools... Reply
  • Barnassey - Monday, December 24, 2012 - link

    My main thing is why is anand comparing a QUAD core cpu to a DUAL core With hyper-threading cpu? Of course the hyperthreading cpu will use less power. Reply
  • Reikon - Monday, December 24, 2012 - link

    Because the dual core CPU still outperforms the quad core one? Reply
  • Barnassey - Monday, December 24, 2012 - link

    No because the power consumption will be different. Thats the point im trying to make. Plus anand has shown hes a little biased over the years. Reply
  • r1cky4n - Monday, December 24, 2012 - link

    a single atom core is not equivalent to a single a9 core

    The important metric is performance/watt, not watt/core
    Reply
  • sseemaku - Tuesday, December 25, 2012 - link

    So you want them to disable one of the channels in memory controller and reduce the cache size to match tegra3 for a fair comparison? Reply
  • tempestglen - Monday, December 24, 2012 - link

    It seems that "GPU Workload" and ""Photo Enhance" CPU consumption on summary table are inconsistent with diagrams. Reply
  • tempestglen - Monday, December 24, 2012 - link

    It also seems that Kraken test diagram of total platform power is just same as cpu only diagram. I guess anandtech posted a wrong picture.

    Merry Christmas!
    Reply

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