Thanks for the info on that mate, I don't opn cpu-z and other monitoring software at the same time. I found that Electromigration was causing it. i.e. when vcore is set above 1.5v it causes PC Probe II to behave wierdly. Since I can't run 3.6 with safe voltages, I'm staying at 3.2ghz. Testing out these ram settings now.

By the way, has anyone else had this issue I had of after a failed overclock, the mobo would "ignore" your OS boot hard drive?