Quote Originally Posted by Don_Dan View Post
Just a guess, but the added stress of the GTX 580 might cause the motherboard to clock worse, maybe because some voltages drop? What's you PSU?
Or the REX is really dead.
Your right, a stronger video card or running 2 or more cards puts a bigger load on the cpu and it may not clock as high as with a single card or a lower performing card but this isn't the case for me. I had the system benching with the gfx card before at 6.3ghz, a few weeks back, with no issues. But now I can't even get into windows, even at 6.2ghz. This is with the Antec TPQ-1200 psu.