I've bought a lot of CPU's in my time (by the tray many times) and I think I've had two faulty that I can remember. One Intel P4 that refused to set the correct BUS and one Xeon that died out of the blue. That's out of thousands of chips.
I'd be tempted to find a junk 24 pin ATX board, CPU and memory to test that PSU. I'd also check for shorts between the case and motherboard.
Parts are already on the way back to OC. The problem is that my second chip took 2 weeks to fail and the first one either failed right away and I did not know it or it was faulty from the factory. Either way, I have had 2 chips with the exact same failure which is highly suspect.
I picked up on the second chip failure a lot quicker because of the symptoms I was experiencing. Also, the problems occurred right after the system did a hard reset for no reason and then it would not post.
I did test the PSU with my old Intel system and I encountered no problems for over 2 weeks but that may have been luck. Not sure, all I know is that I want a working system ASAP because that is what I paid for (this is not a shot at OC or their staff as they have been very helpful).