[Tybalt39]

While I can't offer a definitive answer, I have tried both the SetCPUSpeed 1.0d and OC Auto 4.21

I had the best results with Auto4.21

While I could get to 748 with 1.0d, it wasn't stable beyond that point and I would occasionally get an SOD. With Auto 4.21 I am running at 806 (see sig) with no SOD or resets needed unless some app breaks the OC (resets to 528Mhz, then I have to reset the speeds and reset). This doesn't cause any problems other than no longer being OC'd; no SOD, no "lock-up", no freeze, just not as fast any more. This doesn't happen often, and only when I use my GPS software (iGo8 ). Even then, not always...