Hmmmm I would have thought your original PSU would have been enough for what you were running. Wonder if it's actually underpowered or if it's possibly one of those funky "this power supply doesn't like that motherboard" issues like we used to have with the DFI Ultra-Ds?Well after several days of switching parts and testing I found the problem. The power supply. I switched to a hx 620 I had and prime went for over 22hrs before i stopped it. All other tests ran ok too.