Over the Thanksgiving break the intrepid crew over at Chipworks sent over their initial teardown information for Apple’s A9X SoC. The heart of the recently launched iPad Pro, the A9X is the latest iteration in Apple’s line of tablet-focused SoCs. We took an initial look at A9X last month, but at the time we only had limited information based on what our software tools could tell us. The other half of the picture (and in a literal sense, the entire picture) is looking at the physical layout of the chip, and now thanks to Chipworks we have that in hand and can confirm and reject some of our earlier theories.

A9X is the first dedicated ARM tablet SoC to be released on a leading-edge FinFET process, and it’s being paired with Apple’s first large-format tablet, which in some ways changes the rules of the game. Apple has to contend with the realities of manufacturing a larger SoC on a leading-edge process, and on the other hand a larger tablet that’s approaching the size of an Ultrabook opens up new doors as far as space and thermals are concerned. As a result while we could make some initial educated guesses, we’ve known that there would be a curveball in A9X’s design, and that’s something we couldn’t confirm until the release of Chipworks’ die shot. So without further ado:


A9X Die Shot w/AT Annotations (Die Shot Courtesy Chipworks)

Apple SoC Comparison
  A9X A9 A8X A6X
CPU 2x Twister 2x Twister 3x Typhoon 2x Swift
CPU Clockspeed 2.26GHz 1.85GHz 1.5GHz 1.3GHz
GPU PVR 12 Cluster Series7 PVR GT7600 Apple/PVR GXA6850 PVR SGX554 MP4
RAM 4GB LPDDR4 2GB LPDDR4 2GB LPDDR3 1GB LPDDR2
Memory Bus Width 128-bit 64-bit 128-bit 128-bit
Memory Bandwidth 51.2GB/sec 25.6GB/sec 25.6GB/sec 17.1GB/sec
L2 Cache 3MB 3MB 2MB 1MB
L3 Cache None 4MB 4MB N/A
Manufacturing Process TSMC 16nm FinFET TSMC 16nm &
Samsung 14nm
TSMC 20nm Samsung 32nm

 

Die Size: 147mm2, Manufactured By TSMC

 

First off, Chipworks’ analysis shows that the A9X is roughly 147mm2 in die size, and that it’s manufactured by TSMC on their 16nm FinFET process. We should note that Chipworks has only looked at the one sample, but unlike the iPhone 6s there’s no reason to expect that Apple is dual-sourcing a much lower volume tablet SoC.

At 147mm2 the A9X is the second-largest of Apple’s X-series tablet SoCs. Only the A5X, the first such SoC, was larger. Fittingly, it was also built relative to Apple’s equally large A5 phone SoC. With only 3 previous tablet SoCs to use as a point of comparison I’m not sure there’s really a sweet spot we can say that Apple likes to stick to, but after two generations of SoCs in the 120mm2 to 130mm2 range, A9X is noticeably larger.

Some of that comes from the fact that A9 itself is a bit larger than normal – the TSMC version is 104.5mm2 – but Apple has also clearly added a fair bit to the SoC. The wildcard here is what yields look like for Apple, as that would tell us a lot about whether 147mm2 is simply a large part or if Apple has taken a greater amount of risk than usual here. As 16nm FinFET is TSMC’s first-generation FinFET process, and save possibly some FPGAs this is the largest 16nm chip we know to be in mass production there, it’s reasonable to assume that yields aren’t quite as good as with past Apple tablet SoCs. But whether they’re significantly worse – and if this had any impact on Apple’s decision to only ship A9X with the more expensive iPad Pro – is a matter that we’ll have to leave to speculation at this time.

Finally, it's also worth noting just how large A9X is compared to other high performance processors. Intel's latest-generation Skylake processors measure in at ~99mm2 for the 2 core GT2 configuration (Skylake-Y 2+2), and even the 4 core desktop GT2 configuration (Intel Skylake-K 4+2) is only 122mm2. So A9X is larger than either of these CPU cores, though admittedly as a whole SoC A9X contains a number of functional units either not present on Skylake or on Skylake's Platform Controller Hub (PCH). Still, this is the first time that we've seen an Apple launch a tablet SoC larger than an Intel 4 core desktop CPU.

GPU: PVR 12 cluster Series7

One thing we do know is that Apple has invested a lot of their die space into ramping up the graphics subsystem and the memory subsystem that feeds it. Based on our original benchmark results of the A9X and the premium on FinFET production at the moment, I expected that the curveball with A9X would be that Apple went with a more unusual 10 core PowerVR Series7 configuration, up from 6 cores in A9. Instead, based on Chipworks’ die shot, I have once again underestimated Apple’s willingness to quickly ramp up the number of GPU cores they use. Chipworks’ shot makes it clear that there are 12 GPU cores, twice the number found in the A9.

In Imagination’s PowerVR Series7 roadmap, the company doesn’t have an official name for a 12 core configuration, as this falls between the 8 core GT7800 and 16 core GT7900. So for the moment I’m simply calling it a “PowerVR 12 cluster Series7 design,” and with any luck Imagination will use a more fine-grained naming scheme for future generations of PowerVR graphics.

In any case, the use of a 12 core design is a bit surprising since it means that Apple was willing to take the die space hit to implement additional GPU cores, despite the impact this would have on chip yields and costs. If anything, with the larger thermal capacity and battery of the iPad Pro, I had expected Apple to use higher GPU clockspeeds (and eat the power cost) in order to save on chip costs. Instead what we’re seeing is a GPU that essentially offers twice the GPU power of A9’s GPU. We don’t know the clockspeed of the GPU – this being somewhat problematic to determine within the iOS sandbox – but based on our earlier performance results it’s likely that A9X’s GPU is only clocked slightly higher than A9’s. I say slightly higher because no GPU gets 100% performance scaling with additional cores, and with our GFXBench Manhattan scores being almost perfectly double that of A9’s, it stands to reason that Apple had to add a bit more to the GPU clockspeed to get there.

Meanwhile looking at the die shot a bit deeper, it’s interesting how spread out the GPU is. Apple needed to place 6 clusters and their associated shared logic on A9X, and they did so in a decidedly non-symmetrical manner. On that note, it’s worth pointing out that while Apple doesn’t talk about their chip design and licensing process, it’s highly likely that Apple has been doing their own layout/synthesis work for their PowerVR GPUs since at least the A4 and its PowerVR SGX 535, as opposed to using the hard macros from Imagination. This is why Apple is able to come up with GPU configurations that are supported by the PowerVR Rogue architecture, but aren’t official configurations offered by Imagination. A8X remains an especially memorable case since we didn’t initially know Series6XT could scale to 8 GPU cores until Apple went and did it, but otherwise what we see with any of these recent Apple SoCs is what should be a distinctly Apple GPU layout.

Moving on, the memory controller of the A9X is a 128-bit LPDDR4 configuration. With twice as many GPU cores, Apple needs twice as much memory bandwidth to maintain the same bandwidth-to-core ratio, so like the past X-series tablet SoCs, A9X implements a 128-bit bus. For Apple this means they now have a sizable 51.2GB/sec of memory bandwidth to play with. For a SoC this is a huge amount of bandwidth, but at the same time it’s quickly going to be consumed by those 12 GPU cores.

L3 Cache: None

Finally let’s talk about the most surprising aspect of the A9X, its L3 cache layout. When we published our initial A9X results we held off talking about the L3 cache as our tools pointed out some extremely unusual results that we wanted to wait on the Chipworks die shot to confirm. What we were seeing was that there wasn’t a section of roughly 50ns memory latency around the 4MB mark, which in A9 is the transfer size at which we hit its 4MB L3 victim cache.

What Chipworks’ die shot now lets us confirm is that this wasn’t a fluke in our tools or the consequence of a change in how Apple’s L3 cache mechanism worked, but rather that there isn’t any L3 cache at all. After introducing the L3 cache with the A7 in 2013, Apple has eliminated it from the A9X entirely. The only cache to be found on A9X are the L1 and L2 caches for the CPU and GPU respectively, along with some even smaller amounts for cache for various other functional blocks.

The big question right now is why Apple would do this. Our traditional wisdom here is that the L3 cache was put in place to service both the CPU and GPU, but especially the GPU. Graphics rendering is a memory bandwidth-intensive operation, and as Apple has consistently been well ahead of many of the other ARM SoC designers in GPU performance, they have been running headlong into the performance limitations imposed by narrow mobile memory interfaces. An L3 cache, in turn, would alleviate some of that memory pressure and keep both CPU and GPU performance up.

One explanation may be that Apple deemed the L3 cache no longer necessary with the A9X’s 128-bit LPDDR4 memory bus; that 51.2GB/sec of bandwidth meant that they no longer needed the cache to avoid GPU stalls. However while the use of LPDDR4 may be a factor, Apple’s ratio of bandwidth-to-GPU cores of roughly 4.26GB/sec-to-1 core is identical to A9’s, which does have an L3 cache. With A9X being a larger A9 in so many ways, this alone isn’t the whole story.

What’s especially curious is that the L3 cache on the A9 wasn’t costing Apple much in the way of space. Chipworks puts the size of A9’s 4MB L3 cache block at a puny ~4.5 mm2, which is just 3% the size of A9X. So although there is a cost to adding L3 cache, unless there are issues we can’t see even with a die shot (e.g. routing), Apple didn’t save much by getting rid of the L3 cache.

Our own Andrei Frumusanu suspects that it may be a power matter, and that Apple was using the L3 cache to save on power-expensive memory operations on the A9. With A9X however, it’s a tablet SoC that doesn’t face the same power restrictions, and as a result doesn’t need a power-saving cache. This would be coupled with the fact that with double the GPU cores, there would be a lot more pressure on just a 4MB cache versus the pressure created by A9, which in turn may drive the need for a larger cache and ultimately an even larger die size.

As it stands there’s no one obvious reason, and it’s likely that all 3 factors – die size, LPDDR4, and power needs – all played a part here, with only those within the halls of One Infinite Loop knowing for sure. However I will add that since Apple has removed the L3 cache, the GPU L2 cache must be sizable. Imagination’s tile based deferred rendering technology needs an on-chip cache to hold tiles in to work on, and while they don’t need an entire frame’s worth of cache (which on iPad Pro would be over 21MB), they do need enough cache to hold a single tile. It’s much harder to estimate GPU L2 cache size from a die shot (especially with Apple’s asymmetrical design), but I wouldn’t be surprised of A9X’s GPU L2 cache is greater than A9’s or A8X’s.

In any case, the fact that A9X lacks an L3 cache doesn’t change the chart-topping performance we’ve been seeing from iPad Pro, but it means that Apple has once more found a way to throw us a new curveball. And closing on that note, we’ll be back in December with our full review of the iPad Pro and a deeper look at A9X’s performance, so be sure to stay tuned for that.

Source: Capped A9X Photo Courtesy iFixit

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  • nofumble62 - Monday, November 30, 2015 - link

    Not surprise at all if you follow their strategy in the last several years. ARM camp is trying to increase performance while stay within the power envelope. Intel is trying to reduce its power consumption while keeping performance flat. I think they have both succeeded today although the ARM has a lot more market momentum. At the moment I am typing using a Lenovo Yoga 2 10" tablet with a detachable keyboard (like the Surface). I just bought this device for less than $200, and its battery last all day. Beat that Apple.

    Now, for Apple to switch the CPU of all of their Mac, you have to put on a different hat. What is the cost of switching? and how the customer would benefit from it? Sure, Apple may save some money on the chip, but not a lot. The Mac volume is not that big as compared to the whole PC. But the cost of porting all the software ecosystem is huge. What about Windows compatibility? Also, Apple has been using a lot of PC hardware standard such as mSATA, USB, Thunderbolt, M2, PCIe for free over the years. They won't be free when they switched CPU. And last but not least, what do the buyers benefit from this? Cheaper Apple hardware? yah right.
    Reply
  • Constructor - Monday, November 30, 2015 - link

    You misunderstand Apple's motivations.

    Apple has no interest whatsoever in making their products cheaper – they are pretty much the only computer manufacturer who is not participating in the downward spiral their competitors are caught in for lack of differentiation (they all have to use Windows, they all have to use Intel (or at most Intel-compatible) CPUs, so something's gotta give: And the sticker price is pretty much the only thing left in the PC market nowadays).

    Apple is all about not getting into that race, and their whole game is working their butts off to offer unique selling points instead, something no PC manufacturer really can.

    And those primarily revolve around OS X and its sibling iOS, and hardware-wise special points in build quality, performance and battery life. With Intel CPUs differentiation of Macs against Windows PCs has been difficult and limited. Switching to their own CPUs will give them a world of options which they've never had. They "just" have to actually reach performance/power points which are attractive to their customers so they're motivated for paying the prices Apple wants to ask for their unique products.

    The cost of the CPUs is a factor, but given that Apple is already paying for all the heavy lifting in their CPU development from the iPhone profits and that even their more expensive contract manufacturing easily beats Intel's prices that's actually just another motivation for getting away from Intel.

    They're the only computer manufacturer in the market with their own OS, with their own CPUs and with almost complete freedom to develop all of that in any direction they like and with much fewer legacy pressures.

    The more unique their products are, the less pressure on the prices, at least from the customer segment actually interested in those unique selling points.

    That is what Apple is all about, not simply making cheaper versions of their existing products as the PC manufacturers are pretty much forced to.
    Reply
  • id4andrei - Tuesday, December 1, 2015 - link

    They're not the only one. High end, high margin justifying products exist from other manufacturers. Surfacebook/SurfacePro, S6 edge and Note series, high end consumer and pro level hardware from Dell/HP/Lenovo/Asus.

    There will be nothing cooler than seeing Apple go alone in the PC space with ARM CPUs.
    Reply
  • Guest8 - Tuesday, December 1, 2015 - link

    I would love for Apple to go the way of OS X R/T Reply
  • Constructor - Tuesday, December 1, 2015 - link

    Apple is increasingly taking over the high-margin segment of the computer market just like they already own the high-margin segment in smartphones.

    PC manufacturers are increasingly relegated to bit player status there – their bigger sales numbers are not happening vis-a-vis Apple's products but in the low-margin segments where Apple doesn't even want to compete.
    Reply
  • Michael Bay - Tuesday, December 1, 2015 - link

    High-margin and razor-thin number wise. Apple is literally a phone company now, a one trick pony status Jobs desperately worked to avoid. Reply
  • Constructor - Tuesday, December 1, 2015 - link

    Nope. Apple is still one of the few biggest computer manufacturers by now, even though they only sell high-margin products – and they are one of the few with growing volume at the same time!

    So much for conventional "wisdom".
    Reply
  • id4andrei - Wednesday, December 2, 2015 - link

    They are growing but it's nothing explosive. It's buckling the trend that's for sure. Then there's the element of image/status symbol that belongs exclusively to a macbook. It's unfair to take a Lenovo Thinkpad Carbon, a high end device, compare it to a 12" macbook and say they are competing in the same market. They don't. Reply
  • akdj - Thursday, December 3, 2015 - link

    Double digit (high double digit) percentages YoY certainly seem 'explosive' to me. Especially considering EVERY other OEM is down, YoY each and every quarter over the last three or four years Reply
  • Speedfriend - Tuesday, December 1, 2015 - link

    Apple has not been caught in the downward price spiral? Really? Maybe in phones but in PCs they have followed the competition down. MacBook Air launched at $1800 and now is half that as PC ultra books have dropped in price. Reply

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