alt Hacker NewsIs that really the long pole in the tent, though?
No doubt the most tightly integrated package can outperform a looser collection of components. But if we could shorten the distances, tighten the tolerances, and have the IC companies work on improving the whole landscape instead of just narrow, disjointed pieces slowly one at a time, then would the unsoldered connections still cause a massive performance loss or just a minor one?
Yes. Signal integrity is so finicky at frequencies DRAM operates that whether you drill the plated holes on boards that complete the circuit to go completely through the board or stop it halfway starts to matter due to signals permeating into the stubs of the holes and reflecting back into the trace causing interference. Adding a connector between RAM and CPU is like extending that long pole in the tent in the middle by inserting a stack of elephant into what is already shaped like an engine crankshaft found in a crashed wreck of a car.
Besides, no one strictly need mid-life upgradable RAMs. You're just wanting to be able to upgrade RAM later after purchase because it's cheaper upfront and also because it leaves less room for supply side for price gouging. Those aren't technical reasons you can't option a 2TB RAM on purchase and be done for 10 years.