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Been having boot issues for a while on a B-grade Z77-UD5H board and I always put it down to the memory, but that was tested today in another machine and passed everything so it's either the IMC or the main board.

Most slots on the main board show errors in memtest86 with the memory, slot 3 works fine.

What's the chances that the IMC in my 2500k is at fault instead of the motherboard?