Apple Announces M2 SoC: Apple Silicon for Macs Updated For 2022by Ryan Smith on June 6, 2022 5:30 PM EST
Though primarily a software-focused event, Apple’s WWDC keynotes are often stage for an interesting hardware announcement or two as well, and this year Apple did not disappoint. At the company’s biggest Mac-related keynote of the year, Apple unveiled the M2, their second-generation Apple Silicon SoC for the Mac (and iPad) platform. Touting modest performance gains over the original M1 SoC of around 18% for multithreaded CPU workloads and 35% in peak GPU workloads, the M2 is Apple’s first chance to iterate on their Mac SoC to incorporate updated technologies, as well as to refresh their lower-tier laptops in the face of recent updates from their competitors.
With the king of the M1 SoCs, M1 Ultra, not even 3 months behind them, Apple hasn’t wasted any time in preparing their second generation of Apple Silicon SoCs. To that end, the company has prepared what is the first (and undoubtedly not the last) of a new family of SoCs with the Apple Silicon M2. Designed to replace the M1 within Apple’s product lineup, the M2 SoC is being initially rolled out in refreshes of the 13-inch MacBook Pro, as well as the MacBook Air – which is getting a pretty hefty redesign of its own in the process.
The launch of the M2 also gives us our first real glimpse into how Apple is going to handle updates within the Apple Silicon ecosystem. With the iPhone family, Apple has kept to a yearly cadence for A-series SoC updates; conversely, the traditional PC ecosystem is on something closer to a 2-year cadence as of late. M2 seems to split this down the middle, coming about a year and a half after the original M1 – though in terms of architecture it looks closer to a yearly A-series SoC update.
From a high level, there has been a limited number of changes with the M2 – or at least as much as Apple wants to disclose at this time – with the focus being on a few critical areas, versus the bonanza that was the initial M1 SoC. While all of this is preliminary ahead of either further disclosures from Apple or getting hands-on time with the hardware itself, the M2 looks a lot like a derivate of the A15 SoC, similar to how the M1 was derived from A14. As a result, at first glance the M1 to M2 upgrade looks quite similar to the A14 to A15 upgrade.
According to Apple, the new SoC is comprised of roughly 20 billion transistors, which is 4B (25%) more than the original M1 – and 5B more than the A15 SoC. The chip is being made on what Apple terms a “second generation 5nm” process, which we believe is likely TSMC’s N5P line, the same line used for the A15 SoC. N5P offers improved performance characteristics versus N5, but not density improvements. So while Apple doesn’t disclose die sizes, the company’s side-by-side die shots are at least accurate in that M2 is going to be a bigger chip than M1.
|Apple Silicon SoCs|
|CPU||4x High Performance (Avalanche?)
16MB Shared L2
4x High Efficiency (Blizzard?)
4MB Shared L2
|4x High Performance (Firestorm)
12MB Shared L2
4x High Efficiency (Icestorm)
4MB Shared L2
8x 16-bit CH
100GB/sec Total Bandwidth (Unified)
8x 16 CH
68GB/sec Total Bandwidth (Unified)
H.264, H.265, ProRes, ProRes RAW
|Transistors||20 Billion||16 Billion|
|Mfc. Process||"Second Generation 5nm"
Starting from the top, in terms of their Arm-architecture CPU cores, the M2 retains Apple’s 4 performance plus 4 efficiency core configuration. Apple is not disclosing what generation CPU cores they’re using here, but based on the performance expectations and timing, there’s every reason to believe that these are the Avalanche and Blizzard cores that were first introduced on the A15.
With regards to performance, Apple is saying that the M2 offers 18% improved multi-threaded CPU performance versus the M1. The company does not offer a breakdown of clockspeeds versus IPC gains, but if our hunch about M2 being Avalanche/Blizzard is correct, then we already have a good idea of what the breakdown is. Relative to the Firestorm core in the A14/M1, Avalanche offers only modest performance gains, as Apple invested most of their improvements into improving overall energy efficiency. As a result, the bulk of the performance gains there come from increased clockspeeds rather than IPC improvements.
The performance CPU cores on M2 also come with a larger pool of L2 cache, which also serves to improve performance. Whereas M1 had 12MB of L2 cache shared among the cores, M2 brings this up to 16MB, a 4MB increase over both the M1 and for that matter the A15.
Based on what we’ve already seen with the A15, this bigger update in this generation is on the efficiency core side of matters. The Blizzard CPU cores are increasingly behaving like not-so-little cores, offering relatively high performance and a much wider backend design than what we see with other Arm efficiency cores. Among other things, Blizzard added a fourth Integer ALU, which combined with other changes gave A15 a significant (28%) performance increase in those cores. Carried over to M2, and it’s not unreasonable to expect similar gains, though the wildcard factor will be what clockspeeds Apple dials things to.
This, in turn, is also seemingly why Apple has decided to focus on MT performance for their Apple-to-Apple comparison. With the largest performance gains coming courtesy of the efficiency cores, in performance-bound situations it’s MT workloads which get to tap the E cores alongside the P cores that would see the greatest performance improvements. On the whole, Avalanche/Blizzard made for a modest year on the CPU microarchitecture front, and that looks to be carrying over for the M2 SoC.
Meanwhile on the GPU front, Apple is going bigger. Though reclusive as always about the underlying architecture – merely calling this a “next generation” GPU – M2 comes with 10 GPU cores baked in, up from 8 on the M1. Officially, this GPU is rated for 3.6 TFLOPS, which is a 1 TFLOPS more than the 8 core M1. As well, the new GPU comes with a larger shared L2 cache, though Apple isn’t disclosing the cache size there.
With a combination of a larger core count and what would seem to be a 10% or so increase in GPU clockspeeds (based on TFLOPS), Apple is touting two performance figures for the M2’s GPU. At iso-power (~12W), the M2 should deliver 25% faster GPU performance than the M1. However the M2’s GPU can, for better or worse, also draw more power than the M1’s GPU. At its full power state of 15 Watts, according to Apple is can deliver 35% more performance.
Overall this indicates that while Apple has been able to improve their energy efficiency – GPUs love running wide and slow – Apple’s peak GPU power consumption is going up. This should have minimal impact on light workloads, but it will be interesting to see what it means for relatively heavy and constant workloads, especially on the fanless MacBook Air. Meanwhile the GPU’s display controller remains seemingly unchanged, topping out at 6K for external monitors.
Tangential to the GPU updates, M2 also comes with an updated video encode/decode block, which at first glance looks a lot like a pared-down version of the block used on the M1 Pro/Max. Those SoCs added support for Apple’s ProRes and ProRes RAW codecs, and that support has now filtered back down into the base M2 SoC. As well, Apple is now officially supporting 8K video decode on the M2, whereas the M1, though never having an official resolution designation, was essentially a 4K part.
Finally, on the processing side of matters, the M2 is inheriting the A15’s updated neural engine. According to Apple, this is still a 16-core design, and it happens to have the same 15.8 trillion operations per second (TOPS) rating as the A15’s neural engine. Which, despite only being on par with the A15, still makes it 40% faster than the M1’s neural engine, which topped out at 11 TOPS.
Altogether, Apple is projecting a great deal of confidence in the performance of their second-generation Apple Silicon chip, and even more so its competitiveness versus Intel. While we’ll have to wait to get our hands on the hardware to confirm its performance, the M1 certainly lived up to claims there. So the expectations for M2 are similarly high.
Memory: LPDDR5-6400, Up To 24GB
While the core logic of Apple’s latest SoC would seem to be largely an enhanced version of the A15, it does have one very notable feature advantage: LPDDR5 support.
Whereas the vanilla M1 (and the A15) only supported LPDDR4x memory, the M2 supports the newer LPDDR5 memory standard. The biggest change of which is support for much higher memory clockspeeds; based on Apple’s figures, the M2 is running at 6400Mbps/pin (LPDDR5-6400), which is up significantly from the 4266Mbps/pin (LPDDR4x-4266) memory clockspeeds of the original M1. The net result is that, on the SoC’s 128-bit memory bus, the M2 has 100GB/second of memory bandwidth to play with, a 50% increase over the M1 (~68GB/sec).
Apple’s unconventional use of memory technologies remains one of their key advantages versus their competitors in the laptop space, so a significant increase in memory bandwidth helps Apple to keep that position. Improvements in memory bandwidth further improve every aspect of the SoC, and that especially goes for GPU performance, where memory bandwidth is often a bottlenecking factor, making the addition of LPDDR5 a key enabler for the larger, 10-core GPU. Though in this case, it's the M2 playing catch-up in a sense: the M1 Pro/Max/Ultra all shipped with LPDDR5 support first, the M2 is actually the final M-series chip/tier to get the newer memory.
Past that, Apple is once again placing their LPDDR5 memory packages on-chip with the processor die itself. So each M2 chip will need to be equipped with memory ahead of time, and the device supply is likely to fluctuate a bit based on memory capacity depending on what the most popular configurations are, especially early on.
M2 devices are available with either, 8GB, 16GB, or 24GB of memory. Given that Apple is still using just two stacks of memory, it looks like the company is finally taking advantage of LPDDR’s support for non-power-of-two die sizes (e.g. 12Gb dies), which allows them to get 12GB of memory into a single package without any further shenanigans. And assuming Apple replicates this down the line for the obligatory Pro/Max/Ultra SoCs, we should see the top memory capacities of all of Apple’s SoCs increase by 50% over the previous generation.
And the Rest: Updated ISP, Same USB
Rounding out today’s M2 announcement, there are a couple more items that warrant a quick call-out.
First, the M2 is getting an updated ISP as well as an updated Secure Enclave. Like other aspects of M2, these are likely inherited from the A15, which received similar updates as well.
Meanwhile, a look at the specs of the new MBA and MBP indicate that there haven’t been any notable changes in USB or other I/O support for the new SoC. M1 was already at the top of the curve in 2020 when it launched with USB4 support, so nothing has changed here. This does mean, however, that the SoC is seemingly still limited to Thunderbolt 3 support, despite the fact that Thunderbolt 4 has now been out for well over a year. Both the MBA and MBP are also shipping with two USB ports, so it would seem that’s still the native limit of the SoC.
Apple also hasn’t talked at all about PCIe capabilities. We’ll know more once we have the hardware in-hand, but at least for now there’s no reason to believe that Apple has added PCIe 5 support or changed the number of lanes available. I/O has remained something of a constraining factor for the entire Apple Silicon family, so it does make me wonder about what this means for the eventual Apple Silicon Mac Pro.
Available in July
Closing out today’s announcement, the M2 will be shipping in the new 2022 MacBook Air, as well as the refresh 2022 12-inch MacBook Pro. According to Apple, those devices will be available in July, with pre-orders open today.
In the meantime, the M1 isn’t going anywhere. Besides being at the heart of the Mac Mini – which didn’t receive an update today – Apple is keeping the 2020 M1-based MacBook Air around. So both versions of the entry-level M-series SoC will be sticking around for some time to come.
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mode_13h - Tuesday, June 7, 2022 - link> put in a motherboard that actually had PCIe slots, m.2 slots, DDR5 DIMM slots
Who knows about the M2, but the M1 didn't have much more PCIe lanes than needed for a M.2 slot. Also, didn't have an extra memory controller for external DDR5.
The M1 chips were designed for thin & light laptops, first and foremost. They'll make a CPU for the next Mac Pro that has more PCIe lanes and supports external DRAM.
t.s - Tuesday, June 7, 2022 - link"They'll make a CPU for the next Mac Pro that has more PCIe lanes and supports external DRAM." Sources?
Apple is Apple because their vertical integration and massive savings + walled garden because of that. I think it's oxymoron for them to make a socketed CPU+GPU.
mode_13h - Wednesday, June 8, 2022 - link> Sources?
The current Mac Pro has 64 PCIe lanes. They aren't going to release something with much less than that, which tells us it's not going to use a M1 Max die.
Also, it probably has to support a couple TB of DDR5, which suggests they're going to have to use external DRAM.
No, I'm not a Mac whisperer. Watch name99's posts. He seems to follow them more closely than most. He also has a twitter (under a different name). You can find it if you search for his M1 Explainer.
xol - Monday, June 6, 2022 - linkThe 100GB/s main memory bandwidth seems quite modest for CPU+GPU, but Apple has large on chip caches .. they like to make comparison with x64 which makes sense as it is their main competitor..
But there's another direct chip comparison that is interesting to make (but unfortunately hard to test easily) - that's with Nvidia's ORIN chips - in fact just their half-size ORIN NX.
ORIN 200GB/s bandwidth(double) ; ~4TFLOPS GPU (close), 8/12 A78 cores @2GHz+ (less, but could be close with 12 cores) ; "Neural" - similar 10-20 TOPS ; AV encode/decode - Nvidia seems better here (?) ; power 15-60W ; transistors (17 billion when 12 cores) ..
It would be an interesting comparison with M1/M2 , even more so since Orin is made on the inferior Samsung 8nm node ..
The comparison would be difficult in practice, but could shine some light on Apple's skill as a chip maker (and not necessarily the 'flawless victory' they can claim against x64)
anonomouse - Monday, June 6, 2022 - linkOrin is a much larger chip (hence the doubled bandwidth). It plays closer to the M1 Pro than the M1/M2 proper.
Which may also play into why the AGX Orin module is 900$ (for 1K units) for the mostly-fully-enabled version, $1600 for the full-fat experience.
The Orin NX module variants are probably closer to this thing, conveniently with equal memory bandwidth too, and to get there they chop off/harvest half of the GPU.
That being said, Orin is also made for a different market with different requirements. It'd probably be pretty interesting if Nvidia built a proper Tegra SoC again for actual mobile products and how that might compare to this. Like a Tegra Windows on Arm SoC.
brucethemoose - Monday, June 6, 2022 - linkYeah, they are in better position than most to do such a thing (including Qualcomm).
I think their compute customers would be interested in a datacenter "APU" akin to Intel's Falcon Shores, which they could bin and spin into a M1-Max-esque product.
xol - Tuesday, June 7, 2022 - link"Orin is a much larger chip" - well it has 17B transistors, vs 16/20B for the M1/M2 .. a larger chip by die size though
"It'd probably be pretty interesting if Nvidia built a proper Tegra SoC again for actual mobile products and how that might compare to this." - supposedly Nvidia has designed a Orin variant "T239" for Nintendo, presumably for a Switch 2 (?) .. all I know is it has 1536 Ampere cores halfway between Orin and Orin NX. It seems to be real based based on API leaks and other stuff.. I'm assuming it's another mobile part but I may be wrong.
Definitely far more capable than anything Qualcomm has right now, maybe Nuvia will change that..
iphonebestgamephone - Tuesday, June 7, 2022 - linkQualcomm claims 1.8 tflops for 8cx, and 8cx gen 3 is claimed to have 60% gpu perf increase. And they are also using the x1 cores in it, looks like they are just behind in multicore for now, compared to this t239.
domboy - Tuesday, June 7, 2022 - linkI'd love it if nVidia got back to making Tegra SoCs for Windows on ARM! Last one they did was the Tegra4 back in 2013 I believe. I don't mind the Qualcomm chip in the Surface Pro X, but I suspect nVidia could do better. Especially on the GPU side, as they've been writing Windows drivers for a long time.
mode_13h - Tuesday, June 7, 2022 - link> The 100GB/s main memory bandwidth seems quite modest for CPU+GPU
It's significantly more than any other laptop or desktop APU.
Not more than consoles, though. Even the first-gen PS4 had more.