Originally Posted by ixtapalapaquetl
I am still waiting for more users to confirm that this problem is not isolated to just my rig. However, initial reports support the theory that Opterons with high TDP's (like Dual Cores at 110W, 152/154 at 104W, and quite possibly 148/150 at 85.3W) will experience a .05V jump in Vcore under load that will not be reported by MBM, CPUZ, SpeedFan, or even OCCT (which uses one of the aforementioned for its monitoring).
So what is safe? That is question for you to answer. In the absence of a multimeter, conservatively add .11V to your software-reported Vcore to be safe. At stock, that is surely safe. I would (and am) willing to go as high as 1.54 in CPUZ, but I am fairly aggressive. It should also be noted that while this problem has been confirmed in both DFI Crossfires and regular nF4's, it is NOT a problem with the Expert board (thanks OPPAINTER - I just ordered mine literally 10 minutes ago!) Watch your temps, and if your rig gets crashy or freezy, you should back off quick. I will keep you posted...