Now I'm wondering about my Enermax P.S. Reason being, I just swapped in a Radeon 9800 (non-Pro) and I can't even get a signal to the monitor. Took the 9800 back out and put it in a different computer, it works fine. Put the Radeon 8500 back in to new rig, and it works fine too (ie. no lockups). Take the 8500 out of new rig again, replace with the X800 ... lockups are back in a vengeance.
Common thread here : Both the 9800 and the X800 require a connection to the P.S., but the 8500 does not. I think the most convincing part is that the 9800 won't work at all in the new rig, although I would have thought the X800 to be even more power hungry.
Weird, cause the Enermax has a dedicated standard connector for vid cards and that's what I have been using.