I had my E8400 @4.0Ghz for almost two years with 1.45v, the computer would be on for days sometimes, even in the hottest days of the summer, it ran for a few days with no fan, just my bare Thermolab Baram; all this with no issues. I now have my Phenom II X4 965 with 1.567 in the BIOS (1.537 idle in Windows) with no problems so far, mind you it's been like this only three months, I hope it lasts!