[Numerlor]

The socket io locks in the amount of memory channels. Some pins could be repurposed but that's pretty much a new socket anyway.

They could in theory do on package dram as faster first level memory, but I doubt we'll see that anytime soon on desktop and it probably wouldn't fit under the heat spreader

[dogma1138]

They already do the latter with X3D.

You won’t be able to add RAM to the die itself there no room on the interposer really.