this post was submitted on 10 Nov 2023
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Apple uses a unified memory where the memory chips are embedded on the SoC in the first place. The memory modules are on the same silicon wafer the chip is cut from, not separately on the Mobo, and shared directly with the chip in a single pool of memory that the CPU and GPU can access, rather than dedicated memory for each.
Changing the memory means cutting a different piece of silicon for it.
The SoC and memory are separate dies with different manufacturing processes. In the case of M2 it was TSMC for the SoC and SK Hynix for the memory.
When it comes time to package them together, the SoC and memory are soldered to a interposer layer. So the only difference is which size memory chips they solder together for the different memory configurations available.
That's like building a fast car that can only go straight. It's impressive but short-sighted and therefore stupid.
There are specific performance benefits to soldering your memory to the board or making them part of the main die itself. It’s why GPUs have been doing it for a long time, and why laptops with soldered ram can often achieve higher clocks and lower latency than their socketed counterparts. It’s a tradeoff, but a calculated one. I’m sure Apple also adds the extra revenue from absurd upgrade costs into their calculations.
Somebody has never been to a top fuel drag race. Impressive does not even begin to describe what those “fast cars that can only go straight” are capable of.
Ha ha. Most people don't use their laptops exclusively for one single thing. I sometimes need a laptop that can go fast but more often it needs to be able to many different things. And some years later, let me swap in some more RAM and an SSD to give it another few good years.
This is 100% false. All Apple Silicon Macs use standard LPDDR4X or LPDDR5 memory chips, the same as are used in other computers, which are soldered on a PCB next to the SoC. They are not on the same die. The high memory bandwidth on M1/M2/M3 comes from having a lot of memory controllers built into the SoC -- it's akin to a PC with an 8+ channel memory setup. As far as I'm aware, there's nothing technically preventing Apple from making an Apple Silicon mac with socketed memory again, other than those sweet sweet profits for shareholders.