I was just redoing my machine and decided it might be time to update that bios. I was on a bios that happened to bring the initial ivy bridge support but there had been a few since affecting all areas. With a successful overclock its kinda hard to risk updating. BIOS support can effect stability. Previously 4.4Ghz was rock solid and 4.5 was 99.9% stable at 1.38. I don't have a ton of time to do testing so I had been holding back at 4.3. Previously 4.6Ghz would not boot and 4.7Ghz would not even post with the settings i used. Looky looky i can actually even boot 4.7: Will be a couple days until i can retest 4.5 for 24 hours but I expect to see success. 5.0 however on this sample and cooling will never happen that was my original goal for this machine.