Quote Originally Posted by In-Fluence View Post
MCH reference along with VTT and MCH voltages are probably the cause mate, I wouldn't give up just yet. The aforementioned are crucial to stability on this board, and could result in a bootable, but not 'stressable' system. You might even find that your old PSU required the board to give higher voltages, and you might need to compensate/re-tune.

List your settings and perhaps we can offer some more suggestions
I switched from a HX1000 to a HX850 and I'm still stable with the same bios settings, so it was prolly something else in your case (unless you got a faulty unit ofcourse). My 5870 actually clocked slightly higher at the same volts AFAIK. Not scientificly tested though. Never did a before/after test, but it felt that way. Might have been a placebo too Overall I'm still happy with my HX850 though