[cubefox]

> Perhaps it impacts size, manufacturing (automation) and money considerations. I mean now you suddenly need a slot of golden plated pins, you suddenly need a module with said pins and a memory chip soldered. You're introducing so much steps and complexity (thus expense) there for net negative.

How is this relevant when the same point applies to system RAM?

[butvacuum]

Desktop DDR rarely exceedes 64bits(you have to combine more than one dimm). Since RAM is a parallel bus that means 64 conductors that have to be impedance and length controlled. GPUs use >192bit busses, with 512bit in the high performance GPUs. So that's now 512 conductors.

512 conductors that have to be exactly the same length. Make them longer you'll say- now you just lost your high memory clocks to propigation delay and parasitics.

Seeing the problem?