i have been running 211x19 with 1.356 vcore with qpi set to +0.150 and DRAM voltage set to 2.0v for about a week now. Never had a crash while using the PC for what i normally do. Been playing games like crazy, Backing up DVD's and never had a problem. But the instant i start Linx or Prime i get a BSOD. Guess its not enough voltage somewhere but i have fiddled and fiddled with settings and cant get anything stable. Will not even stabalize at 1.44 vcore. I have come to 2 possible causes. 1 Being as stated the OMC. My ram should be able to do DDR3-2000 but it wont. The other issue i think is HT. I am pretty much fed up with trying to get 4ghz stable. Id rather just run it at default then any other speed than 4ghz.