Mine requires 1.4v (p95 load voltage in cpuz) just to reach and boot 4.5ghz. I will be delidding it this week, I hope the reduction in temperatures will mean I will need less voltage for the same stability. I am running only 1.15v (-.085 offset) for 4.0 ghz 24/7. After 4.0ghz my chip is a total dog. It requires -.03v for 4.1ghz and +.01v for 4.2ghz. 4.4ghz requires +.07v. 4.5 requires +.1v.