CPU Performance

For our cross-platform CPU performance tests we turn to the usual collection of Javascript and HTML5 based browser tests. Most of our comparison targets here are smartphones with two exceptions: Intel's Bay Trail FFRD and Qualcomm's MSM8974 Snapdragon 800 MDP/T. Both of those platforms are test tablets, leveraging higher TDP silicon in a tablet form factor. The gap between the TDP of Apple's A7 and those two SoCs isn't huge, but there is a gap. I only include those platforms as a reference point. As you're about to see, the work that Apple has put into the A7 makes the iPhone 5s performance competitive with both. In many cases the A7 delivers better performance than one or both of them. A truly competitive A7 here also gives an early indication of the baseline to expect from the next-generation iPad.

We start with SunSpider's latest iteration, measuring the performance of the browser's js engine as well as the underlying hardware. It's possible to get good performance gains by exploiting advantages in both hardware and software here. As of late SunSpider has turned into a bit of a serious optimization target for all browser and hardware vendors, but it can be a good measure of an improving memory subsystem assuming the software doesn't get in the way of the hardware.

SunSpider Javascript Benchmark 1.0 - Stock Browser

Bay Trail's performance crown lasted all of a week, and even less than that if you count when we actually ran this benchmark.  The dual-core A7 is now the fastest SoC we've tested under SunSpider, even outpacing Qualcomm's Snapdragon 800 and ARM's Cortex A15. Apple doesn't quite hit the 2x increase in CPU performance here, but it's very close at a 75% perf increase compared to the iPhone 5. Update: Intel responded with a Bay Trail run under IE11, which comes in at 329.6 ms.

Next up is Kraken, a heavier js benchmark designed to stress more forward looking algorithms. Once again we run the risk of the benchmark becoming an optimization target, but in the case of Kraken I haven't seen too much attention paid to it. I hope it continues to fly under the radar as I've liked it as a benchmark thus far.

Mozilla Kraken Benchmark - 1.1

The A7 falls second only to Intel's Atom Z3770. Although I haven't yet published these results, the 5s performs very similarly to an Atom Z3740 - a more modestly clocked Bay Trail SKU from Intel. Given the relatively low CPU frequency I'm not at all surprised that the A7 can't compete with the fastest Bay Trail but instead is better matched for a middle of the road SKU. Either way, A7's performance here is downright amazing. Once again there's a performance advantage over Snapdragon 800 and Cortex A15, both running at much higher peak frequencies (and likely higher power levels too, although that's speculation until we can tear down an S800 platform and a 5s to compare).

Compared to the iPhone 5, the 5s shows up at over 2.3x the speed of last year's flagship.

Next up is Google's Octane benchmark, yet another js test but this time really used as a design target for Google's own V8 js engine. Devices that can run Chrome tend to do the best here, potentially putting the 5s at a disadvantage.

Google Octane Benchmark v1

Bay Trail takes the lead here once again, but again I expect the Z3740 to be a closer match for the A7 in the 5s at least (it remains to be seen how high the iPad 5 version of Cyclone will be clocked). The performance advantage over the iPhone 5 is a staggering 92%, and obviously there are big gains over all of the competing ARM based CPU architectures. Apple is benefitting slightly from Mobile Safari being a 64-bit binary, however I don't know if it's actually getting any benefit other than access to increased register space.

Our final browser test is arguably the most interesting. Rather than focusing on js code snippets, Browsermark 2.0 attempts to be a more holistic browser benchmark. The result is much less peaky performance and a better view at the sort of moderate gains you'd see in actual usage.

Browsermark 2.0

There's a fair amount of clustering around 2500 with very little differentiation between a lot of the devices. The unique standouts are the Snapdragon 800 based G2 from LG, and of course the iPhone 5s. Here we see the most modest example of the A7's performance superiority at roughly 25% better than the iPhone 5. Not to understate the performance of the iPhone 5s, but depending on workload you'll see a wide range of performance improvements.

The Move to 64-bit iPhone Generational Performance & iPhone 5s vs. Bay Trail


View All Comments

  • darkich - Wednesday, September 18, 2013 - link

    Anand really should be ashamed of himself.. doing the same old Java Script(software dependant to a major extent) trick over and over again, and clearly as a day, refusing to include a hardware benchmark such as GB.
    That way, he can keep on kissing Intel's and Apple's behind.
    (Btw I actually love what Apple is doing with its custom ARM chips, and I am really looking forward to the A7X and iPad 5)

    Despicable dishonesty
  • Dug - Wednesday, September 18, 2013 - link

    Funny, you want different information than what's provided and some how you come to the conclusion that it's biased. Yet throughout your post you have nothing to back it up, and all you have added is your own personal comments against Apple. Pot calling the kettle black? And from what I can tell from you blabbering on about 64bit code, you have no educated information on iOS 7 64bit or the 64bit proc. Correct me if I am wrong and show me an app that you have developed for it. In the end it comes down to how well the product will perform, and Anand's review has shown that. And what's this comment 'Native benchmarks don't compare the new apple chip to "old 32 bit v7 chips" - it only compares the new apple chip to the old ones. What 32bit v7 chip are you talking about? And why wouldn't he compare the new chip to the old ones. And what difference does it make? Reply
  • Patranus - Wednesday, September 18, 2013 - link

    What difference does it make if the iOS and Android use different JS engines? Reply
  • StevenRN - Saturday, September 21, 2013 - link

    By "unbiased" you mean a review from a site like AndroidCentral or similar site? Reply
  • barefeats - Wednesday, September 18, 2013 - link

    Excellent review. I'm sharing it with every iPhone freak I know. Reply
  • jimbob07734 - Thursday, September 19, 2013 - link

    I'm sure not gonna be that guy that buys the first Samsung 64 bit chip they slap together to match the A7. I doubt they have even started working on it until last week. Reply
  • NerdT - Monday, September 23, 2013 - link

    All of these graphics performance comparisions (except the off-screen ones) are incorrect and absolutly miss-leading. The reason is that most of the other phones have a 1080p display which has 2.8x higher resolution that iPhone 5s! That being said, all on-screen scores will get bumped up by about the same scale for iPhone because they are calculated based on FPS only, and the frames are render the the device resolution. This is a wrong benchmarking because you are not having an apple to apple comparision. I would have expected a much higher quality report from Anandtech! Please go ahead and correct your report and prevent miss-leading information. Reply
  • akdj - Friday, September 27, 2013 - link

    You're simply wrong. We'll leave it at that. This is objective data. You can't argue that. If you're unhappy with the results, build your own benchmarking app. Question---why would it NOT be relevant (on screen tests) when you're using said product? Is there a chance down the road you're going to upgrade your current 4" display to 4.3"? 5"? 6"---720p? 1080p? Easy answer=No. You can't upgrade your display. The onscreen tests are neither 'wrong', 'incorrect' or 'absolutely misleading'. They are numbers derived from current testing suites and software. You can't compare bananas and beans. They're different. So Android has increased the resolution of their displays in some cases??? Who cares! The numbers are STILL accurate. Again, each unique device is of it's own making. If Anand went forward with his site and your reasoning we wouldn't have any type of way to benchmark or gauge performance. Reply
  • jljaynes - Tuesday, September 17, 2013 - link

    Beast of a chip Reply
  • tredstone - Wednesday, September 18, 2013 - link

    i agree. and to think android fans have been criticizing the a7 and the 5s in general. this chip is amazing . wow, what a phone it is Reply

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