Hector Martin

And by the way, for the repairability folks: replaceable RAM on mobile devices is going away for good reason. Two SODIMMs is 128 bits of multi-GHz bus across multiple cm of board and a connector. That *eats* power. This isn't manufacturers being out to screw us, it's physics.

Put them in a socket?

What *kind* of socket? Even if you do a CPU socket thing ($$$ and adds thickness) just making space for the thing plus the interconnect significantly increases total trace length. There's a reason why the M1 has ~0mm between the SoC die and the memory dies.

People aren't doing these MCMs just for space; you get better electrical performance out of these high spec carriers than a plain old PCB.