Bug Dout wrote:
But the lack of a replaceable CPU need not doom DIY. I have a 5+ year
old DIY PC that I am considering upgrading. But since I want USB 3.0 ports,
that means I have to replace the MB anyway, and probably the case to get
external USB 3.0 ports. And maybe the disk drives to get the latest
high-speed drives there, and of course memory, to get the best.

The point being, after a couple of years, lots of things have to be
replaced, not just the CPU.

Asrock's solution from years ago, was a separate processor
module. Now, this doesn't make a lot of sense, but it gives
another idea of how to chop up hardware if required. The
FSB in that case (edge card), would be HyperTransport.
On an Intel equivalent, that might be DMI or DMI + PCIE.

http://www.asrock.com/mb/spec/upgrad...939CPU%20Board

But you could just as easily do a BGA to PGA adapter PCB
and solder the BGA processors to that, before distribution.
PGA ZIF sockets are a pretty reliable technology, and companies
like Foxconn or Lopes could make one specifically for the purpose,
if called upon. There are plenty of ways to slice it.

http://www.murrietta.com/services_interposers.html

Paul