The SoC

The iPad mini with Retina Display rounds out the three platforms that use Apple’s A7 SoC. Although both the iPad Air and iPhone 5S use the A7, the mini’s implementation is closer in nature to the iPhone. The iPad mini’s SoC has always used the same package-on-package (PoP) assembly as the iPhone, with DRAM stacked on top of the SoC itself (1GB in this case). The benefit is obviously a reduction in board area, the downsides have to do with cost and thermals. That’s the first similarity between the mini’s A7 and the iPhone’s A7.

The second is one of frequencies. While the iPad Air’s A7 runs its two Cyclone CPU cores at up to 1.4GHz, the SoC in the iPad mini and the iPhone 5S runs at up to 1.3GHz. That might sound like a minor difference, but it’s far more pronounced when you look at what happens to frequency when you’re running heavy workloads.

Once again I turn to a fairly heavy CPU workload to plot performance over time. This is a multithreaded workload, slightly modified from what we used in the iPad Air review, designed to make the CPU cores consume max power. The scale is linear and the workload is the same across all devices, so what you’re effectively looking at is a graph of thermally bound CPU performance over time across all three A7 implementations:

Being the largest device (and the only device with a metal heat spreader and no DRAM stacked on top), the iPad Air obviously maintains the highest frequencies for the duration of the test. The iPhone 5S, with a significant reduction in internal volume (and a PoP SoC) reduces its CPU frequencies early on in order to keep skin temperature down and properly manage thermals. The iPad mini with Retina Display falls between the two, with its performance curve more closely following that of the iPhone 5S.

Although the mini has a similar max operating frequency to the iPhone 5S, it is a faster device thanks to it being less thermally constrained. Similarly, the iPad Air can be much faster than its clock speed would otherwise imply. If you’re wondering why Apple has been so focused on building its own SoCs and CPU architectures, this is the reason why. There’s a fixed amount of power you can dissipate in the form of heat in these mobile devices while still maintaining a good user experience. Performance per watt is the gating metric for success in mobile, and shipping high IPC/low frequency dual-core SoCs at 32/28nm is the best optimization available to a company like Apple today.

As you’d expect, our browser based CPU tests show the mini’s A7 performing in between the iPhone 5S and iPad Air. None of these tests are anywhere near as stressful as our thermal test from above, so we don’t see exaggerated differences in performance between the platforms. For most, I suspect you won’t notice a huge performance difference between the mini and Air. Those who are heavier users (e.g. audio mixing, 3D gaming, etc…), there will be a performance difference between the two iPads.

SunSpider 0.9.1 Benchmark

Mozilla Kraken Benchmark (Stock Browser)

Google Octane v1

Browsermark 2.0

WebXPRT - Overall Score

Compared to the first generation iPad mini, the new model is in a completely different performance league. Keep in mind the first mini used Apple’s A5 SoC based on an ARM Cortex A9. That’s the same single threaded performance as what’s in an iPhone 4S, and under iOS 7 it’s clearly running into some performance limits. The new mini with Retina Display however is a completely different animal. It’s fast.

Even comparing to the 4th generation iPad, the new mini is noticeably quicker.

Memory Bandwidth

Looking at the iPad mini’s memory bandwidth curve, we see it tracks very closely with that of the iPhone 5S. This is a slightly modified version of our previous bandwidth test, and you can see peak usable memory bandwidth (from the CPU’s perspective) of around 10GB/s. The ~12GB/s area right before you get out to main memory is bandwidth to the A7’s 4MB system-wide cache that sits after the shared L2 and the memory controller. This cache appears to service CPU, GPU and ISP requests at least.

GPU Performance

I believe the A7’s PowerVR G6430 GPU runs at around 450MHz. This frequency appears unchanged across all three A7 implementations. Once again, the big difference is how much thermal headroom exists in the platform which has an impact on overall performance.

Kishonti’s low level GPU performance tests back up my assertion that GPU frequency is fixed across all A7s. The iPad mini with Retina Display delivers equal performance to the iPad Air. The bigger news here is that nearly all of the GPU bound 3D tests seems to peg the mini and Air as equals. These are some pretty intense tests, but it looks like on the GPU side there’s no significant throttling when running at full tilt.

GLBenchmark 2.7 - Triangle Throughput (Onscreen)

GLBenchmark 2.7 - Triangle Throughput (Offscreen)

GLBenchmark 2.7 - T-Rex HD (Onscreen)

GLBenchmark 2.7 - T-Rex HD (Offscreen)

GLBenchmark 2.5 - Egypt HD (Onscreen)

GLBenchmark 2.5 - Egypt HD (Offscreen)

3DMark Unlimited - Ice Storm

Basemark X (Onscreen)

Basemark X (Offscreen 1080p)

As I mentioned in our iPad Air review, despite having less peak theoretical memory bandwidth than the A5X/A6X, the A7 in the iPad mini never seems to regress in performance compared to even the iPad 4. Across the board the mini appears to be faster, more responsive and have more performance on tap than any prior iPad (big or small). The comparison to the original iPad mini is of course night and day. Even looking at lighter tests like the old GLBench Egypt HD benchmark, the iPad mini with Retina Display manages to be nearly twice as fast as the original mini - all while rendering 4x the number of pixels.

Introduction, Hardware, Usability & Cases The Display


View All Comments

  • ws3 - Saturday, November 16, 2013 - link

    Well there you go. Apple makes excellent products, so they get good reviews. What a surprise.
    Other people also make excellent products and get good reviews. So what's your beef?
  • p_giguere1 - Saturday, November 16, 2013 - link

    Objectivity is equality in opportunity, not outcome.

    The fact Apple products may get recommended more often than competing products in no way proves a lack of objectivity.
  • BPB - Saturday, November 16, 2013 - link

    Agreed. Reply
  • Dennis Travis - Saturday, November 16, 2013 - link

    I like Windows Phones but lets face it, App support is very bad. If I can't get what I need to do what I need to do, I will go to a product that has the support. WP8 does not have that support at the moment anyway. Reply
  • kyuu - Saturday, November 16, 2013 - link

    What a bunch of BS. What oh-so-important apps aren't present on WP8? Reply
  • Puberticus - Saturday, November 16, 2013 - link

    Most of them. Reply
  • MarcSP - Saturday, November 16, 2013 - link

    I have all the apps I need in WP. You do not represent everybody. Case by case. Reply
  • MonkeyPaw - Saturday, November 16, 2013 - link

    Perhaps he knows that he's writing to mainly potential Apple buyers. Let's face it, most people are going to stick with the platform they've already invested in (like apps, music, and videos).

    That said, I never pick up this "bias" that people claim, and I feel these Apple-bias complaints waste so much comment space here. Anand never says "go buy an Apple product or your family will disown you." He doesn't even talk about Apple's peripheral products (Airplay, iTunes, iCloud, etc.), he just calls the products what they are. I don't own a single Apple product, and I'm not a fan of iOS, but I can totally see the quality in Apple's product line, and I can even see why someone would like iOS. I own a Surface 2 and Lumina 521, but I won't deny that Apple makes a good product that lots of people like. That's all I hear Anand say in his articles. The site reviews the hardware, and lets the buyer decide what they want to buy. I just don't get why people take it so personally.
  • Puberticus - Saturday, November 16, 2013 - link

    I think people literally cannot face the prospect that they bought the wrong product. And many will defend what they did to the last dying breath. It literally becomes a religious issue.

    Which IMHO, makes no sense since the technology in question doesn't give a damn about the owner. You can see it on other sites; the minute an Apple product is mentioned, the android fans come out of the woodwork for no other reason than to dis it. And it's obvious they've never touched the product they're criticizing. What the heck is that all about?!?

    Absolutely bizarre.
  • KoolAidMan1 - Sunday, November 17, 2013 - link

    Android fanatics on tech forums are louder and more irrational than any Apple user I've ever seen. Its weird since iDevices cross between both PC and Mac users.

    Teenage console fanboys are more sane than some of those people.

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