Just thought i'ld add my two cents here. I have an i7860 and a EVGA p55 sli. My chip requires 1.425vcore for stability at 4221, with a vtt of 1.45. Of course i have to run my memory at 1.77 to get it to clock over 2000. I'm stable under max stress on intelburntest, I might run it again tonight and post screens.