Apple's M1 series of processors gained a new sibling, the, at WWDC 2022. As with the M1, Apple started at the bottom: The M2 is the base processor in the new line, with some typical generation-over-generation updates, and debuts in the 2022 and . We'll likely see the scaled-up versions -- Ultra, Pro and Max -- when Apple's ready to refresh its higher-end devices.
Theonly scaled up to the in March for the , so it's unsurprising that it may be a wait until the M2 switchover pervades all Apple's systems. The progress from Pro to Max to Ultra shows how Apple scales its hybrid chip line to accommodate higher-power systems. We've still yet to see if linking together a large number of chips will work for the Mac Pro -- the lone remaining Intel-based model. It's possible that some of the changes made for the M2, such as the higher-bandwidth memory controller, were necessary before the chip could be scaled up to Mac Pro-appropriate levels.
Like Intel's hybrid (Alder Lake)and , there are combinations of performance and efficiency cores, plus GPU cores (execution units). Since Apple has fewer partners to please -- just itself, actually -- it doesn't have Intel's need to produce an overwhelming number of confusing variations to allow for desktop and laptop systems to be priced differently. Still, Apple can be just as bewildering because of the distinct CPU and GPU cores in chips that fall under the same name.
For instance, there are at least two variants of every chip, with differing numbers of GPU cores. The M1 Pro additionally tosses in two variants with a different number of CPU cores.
Based on our testing of the new Pro and Air, the M2 delivers a typical generation-over-generation performance lift over the M1 -- about 10% for the CPU and 6-10% per GPU core (our results are for the 7-core M1 vs. the 10-core M2 GPUs) -- and still leaves a significant gap between it and the M1 Pro. The M2 has some general streamlining over the M1 that gives it better performance per watt -- the amount it can do for a given amount of power. Given the redesign of the MacBook Air, it's an attractive upgrade proposition.
The M1 Max and M1 Pro clearly differ in terms of peak performance, with the M1 Max doubling some important contributors to theoretical performance, notably the number of hardwareaccelerators, which are important for professional video editing; the M2 adds them, so they're available on the low-end systems for the first time.
The M1 Max also doubled the bandwidth for some internal interfaces, like that between memory and the processor, and bumped the M2 up. Those won't necessarily "double" the performance delivered in real-world use, though.
Apple M2 vs. M1 vs. M1 Pro vs. M1 Max vs. M1 Ultra
||Apple M1||Apple M2||Apple M1 Pro||Apple M1 Max||Apple M1 Ultra|
|Total CPU cores||8||8||8 or 10||10||20|
|Performance cores||4||4||6 or 8||8||16|
|GPU cores||7 or 8||8 or 10||14 or 16||24 or 32||48 or 64|
|Neural engine cores||16||16||16||16||32|
|Maximum memory supported (UMA)||16GB||24GB||32GB||64GB||128GB|
|Peak memory bandwidth (GBps)||n/a||100||200||400||800|
|Available in||MacBook Air (2021), iPad Pro (5th gen), iMac 24 (2021), Mac Mini||MacBook Air (2022), MacBook Pro 13 (2022)||MacBook Pro 14, MacBook Pro 16 (2021)||MacBook Pro 14, MacBook Pro 16 (2021), Mac Studio||Mac Studio|
Apple took a blunt approach for the M1 Ultra, tying together two M1 Max (24-GPU core) processors and chipsets via a 2.5 terabyte per second direct connection, branded "UltraFusion," rather than having to traverse the slower system bus. So it has two of everything, including two Thunderbolt controllers and two memory controllers. That's why the Mac Studio with the M1 Ultra has more Thunderbolt ports and can accommodate twice the memory of its M1 Max-based counterpart. It's basically a dual-processor system. There are even two versions for both GPU variations of the M1 Max.
And that's likely to make it bigger and hotter. For instance, the chip is easier to scale to larger numbers of CPU and GPU cores, which will be necessary for, but it seems cumbersome to have multiple supporting chipsets as well. The Mac Studio with the M1 Ultra has a huge heatsink and fan system necessary to cool it. Though it likely doesn't deliver twice the performance of the M1 Max, we still don't know how performance scales with the number of processors. This will be its first test.
One thing about both the M1 and M2 implementations thus far is that there is no mention of discrete graphics support. Apple has claimed the Ultra delivers better graphics performance than the AMD cards in the Mac Pro, possibly teeing up a future reveal that it won't have any -- or that it has created a discrete graphics solution based on its GPU technology. Unlike the Mac Studio, which can't be upgraded, the Mac Pro has to be upgradable. That's one of the points of it.
Keep in mind that Apple's unified memory architecture means that memory is shared by the GPU and CPU. That's definitely better for performance, since it makes both processing and graphics tasks faster at passing data between each other.