this post was submitted on 09 Nov 2023
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The Apple M series is not ARM based. It's Apple's own RISC architecture. They get their performance in part from the proximity of the RAM to the GPU, yes. But not only. Contrary to ARM that has become quite bloated after decades of building upon the same instruction set (and adding new instructions to drive adoption even if that's contrary to RISC's philosophy), the M series has started anew with no technological debt. Also Apple controls both the hardware to the software, as well as the languages and frameworks used by third party developers for their platform. They therefore have 100% compatibility between their chips' instruction set, their system and third party apps. That allows them to make CPUs with excellent efficiency. Not to mention that speculative execution, a big driver of performance nowadays, works better on RISC where all the instructions have the same size.
You are right that they do not cater to power users who need a LOT of power though. But 95% of the users don't care, they want long battery life, light and silent devices. Sales of desktop PCs have been falling for more than a decade now, as have the investments made in CISC architectures. People don't want them anymore. With the growing number of manufacturers announcing their adoption of the new open-source RISC-V architecture I am curious to see what the future of Intel and AMD is. Especially with China pouring billions into building their own silicon supply chain. The next decade is going to be very interesting. :)
Interesting, I thought they had ditched the ARM license completely, my mistake.
The whole "Apple products are great because they control both software and hardware" always made about as much sense to me as someone claiming "this product is secure because we invented our own secret encryption".
Here’s an example for that: Apple needed to ship an x86_64 emulator for the transition, but that’s slow and thus make the new machines appear much slower than their older Intel-based ones. So, what they did was to come up with their own private instructions that an emulator needs to greatly speed up its task and added them to the chip. Now, most people don’t even know whether they run native or emulated programs, because the difference in performance is so minimal.
M1s through M3s run ARMv8-A instructions. They're ARM chips.
What you might be thinking of is that Apple has an architectural license, that is, they are allowed to implement their own logic to implement the ARM instruction set, not just permission to etch existing designs into silicon. Qualcomm, NVidia, Samsung, AMD, Intel, all hold such a license. How much use they actually make of that is a different question, e.g. AMD doesn't currently ship any ARM designs of their own I think and the platform processor that comes in every Ryzen etc. is a single "barely not a microprocessor" (Cortex A5) core straight off ARM's design shelves, K12 never made it to the market.
You're right about the future being RISC-V, though, ARM pretty much fucked themselves with that Qualcomm debacle. Android and android apps by and large don't care what architecture they run on, RISC-V already pretty much ate the microcontroller market (unless you need backward compatibility for some reason, heck, there's still new Z80s getting etched) and android devices are a real good spot to grow. Still going to take a hot while before RISC-V appears on the desktop proper, though -- performance-wise server loads will be first, and sitting in front of it office thin clients will be first. Maybe, maybe, GPUs. That'd certainly be interesting, the GPU being simply vector cores with a slim insn extension for some specialised functionality.
Thanks for the clarification. I wonder if/when Microsoft is going to hop on the RISC train. They did a crap job trying themselves at a ARM version a few years back and gave up. A RISC Surface with a compatible Windows 13 and proper binary translator (like Apple did with Rosetta) would shake the PC market real good!
Very confident it is ARM based.