Actually IBM's POWER systems (even the most modern 8's) do use daughter cards for the CPU's, something they kept from the AS/400's design when they moved from CISC (48 bit) to RISC (64 bit) and started re-using, and consolidating, components for the AIX and AS/400 systems into one standardised hardware machine.Just remember old days where even CPUs were expansion cards.
I still have one of these , had no Idea they were worth $50 now. With the extra memory chips in the sockets.turkey3_scratch :It'd be cool if there was more stuff like this. Customize your GPU (VRM, backplate, types of fans, etc.) - though that would probably be something you'd customize online rather than yourself, at least the VRM.
Made to order GPUs would be a neat concept. For modifying it at home, there were quite a few GPUs in the 1990s that you could install extra RAM on, sort of like how you put more RAM in a laptop. I wouldn't mind seeing this happen to GPUs again.