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Just keep an eye on temps. My 5,1 temps told me " Time to re-paste the cpu and Northbridge" My 6,1 has been fine so far.
 
Nice, just keep an eye on the temps.

I bought a 12 core and 8 core (E5-2667) for my 6,1. Originally installed the 12 core and it wouldn't boot, so I swapped in the 8 core version. Which also didn't boot, some debugging later I realised some power cables were loose and it booted with the 8 core. Now I'm nervous about pulling it apart to repaste the GPUs.
 
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