GPU Performance

While we don't quite have real games to benchmark against, we do have benchmarks that are reasonably good approximations of games, which heavily stress the GPU. For the most part, this means that we can see the performance of the A8's PowerVR GX6450 GPU but there are some aspects that are CPU-bound, which we'll discuss after the results.

Edit: Before I get into the results, I must caution that Basemark X will have inaccurate on-screen results as the benchmark was made using XCode 5.x in order to keep scores comparable between versions 1.1 and 1.1.1. This doesn't affect the overall score, which is solely calculated based upon off-screen performance.

3DMark 1.2 Unlimited - Overall

3DMark 1.2 Unlimited - Graphics

3DMark 1.2 Unlimited - Physics

BaseMark X 1.1 - Overall (High Quality)

BaseMark X 1.1 - Dunes (High Quality, Offscreen)

BaseMark X 1.1 - Hangar (High Quality, Offscreen)

BaseMark X 1.1 - Dunes (High Quality, Onscreen)

BaseMark X 1.1 - Hangar (High Quality, Onscreen)

GFXBench 3.0 Manhattan (Onscreen)

GFXBench 3.0 Manhattan (Offscreen)

GFXBench 3.0 T-Rex HD (Onscreen)

GFXBench 3.0 T-Rex HD (Offscreen)

For the most part, we see that the GX6450 is at about the same level as Qualcomm's Adreno 420, which seems to track closely to expectations given that the A7's GPU was around the same performance as the Adreno 330. The 3DMark test does have an interesting result, but it seems that this is because 3DMark's physics test has a strong amount of data dependency that restricts the level of out of order execution that can be done. NVIDIA's Tegra K1 is the current leader in graphics performance, but of course it's also in a tablet instead of a smartphone so it's not a direct competitor.

NAND Performance

As we move towards the goal of seamless performance in everyday tasks, one significant factor is IO performance. While there's definitely a minimum level of performance that allows for generally acceptable smoothness, there's value in having higher storage performance (e.g. prevent bottlenecking in situations such as updating apps in the background). In order to test this, we use Androbench with some custom settings on Android and a custom utility developed by Eric Patno for iOS, who has been quite helpful with furthering our efforts to test storage performance.

Internal NAND - Sequential Read

Internal NAND - Sequential Write

Internal NAND - Random Read

Internal NAND - Random Write

As this is the first time that we've looked into NAND performance on iOS devices, it's definitely worth scrutinizing the data a bit more closely than in most cases. There are a few notable cases here, which are the class-leading speeds for sequential reads and writes on the iPhone 6, but also the rather middling random read and write speeds for the iPhone 6 and 5s. The oddest result is definitely the iPhone 5, which is Ryan's personal unit and while the random read speeds are on the low side, random write speeds are easily record-setting.

In practice, with tablets and smartphones being less multitasking heavy than PCs/laptops, the sequential scores are probably slightly more relevant to the overall user experience. The iPhone 6 results show a significant increase in performance over the iPhone 5s in all of the tests, which is always good to see.

CPU Performance Battery Life and Charge Time
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  • annah_souls - Tuesday, October 28, 2014 - link

    Yes, it's my money and I have a lot of them to buy as much as iPhone as I like. If you don't satisfy Apple product, you may not but $2000 handbag also. Pity you to yell Apple "The world is not fair!" LOL Reply
  • Donkey2008 - Wednesday, October 29, 2014 - link

    People with intelligence don't buy purely on specs, which it seems 100% of Android owners do. I can just picture you like the many Android fanboys I have met....."Deeeerp, it has foure cores witch iz twice as mony as en iPhone so itz twice as fast, Deeeerrp".

    Enjoy your clunky, resource-hog, half-baked Google OS, your extremely inefficient hot-and-crispy quad-core space heater SOC (which has to be throttled by Android so the phone doesn't melt LULZ) and premium plastic-wrapped junk.
    Reply
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  • iphone 3 - Friday, October 31, 2014 - link

    I am wondering if you guys have similar analysis for ipad air 2 A8x Reply
  • odedia - Tuesday, November 4, 2014 - link

    Please check the NAND differences between the 64gb model and the 128gb model. It appears the 128gb model uses TLC and not MLC. Reply
  • curiosity - Thursday, November 6, 2014 - link

    output power / voltage: per channel or combined? Reply
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  • raj parihar - Tuesday, November 3, 2015 - link

    mcf doesn't have any Multiply operations. In A8, its benefiting from a better (tuned) prefetcher possibly with negative (-3 or -1) stride. Reply

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