Check your vdroop while running prime95...I have to get my 965 up to 1.525v - 1.536v before it is stable at 4.1 GHz to 4.2 GHz...I have run it as high as 4.42 GHz at 1.56v while gaming...and 4.31 GHz @ 1.56v prime95 stable...If while running prime95 you are experiencing a lot of vdroop go into BIOS and set LLC to either enable or if you have the option set it to extreme it will limit vdroop...I use CPU-Z to monitor CPU voltages..I am running H2O to cool it ...watch them temps...DANGER: REMEMBER USE OF THESE VOLTAGES IS EXTREME
Hey, what's interesting is that my voltage is actually higher (according to cpu-z) than I set it in the bios.... I have it set to 1.455 and cpu-z reads 1.48. I don't want to push it much further because I'm already at 60c. I brought it back down to 4.0mhz and I'll see if it's stable there at 1.48v according to cpu-z.