500X8, 4GHz superpi32M passed.






The main is on the voltages, enable the clockgen overvoltage, in my case 1.000V is a totally different story when FSB from 490FSB, CPU PLL and NB by trials, I think each CPU will be different to react. I did some of the voltages combinations and find:

Q6600 490FSB X 7

CPU PLL response
CPU: 1.4V CPU PLL: 1.5, FSB: 1.2, VNB: 1.25V Prime95 (Blend) Failed in 1s
CPU: 1.4V CPU PLL: 1.6, FSB: 1.2, VNB: 1.25V Prime95 (Blend) Failed in 1s
CPU: 1.4V CPU PLL: 1.7, FSB: 1.2, VNB: 1.25V Prime95 (Blend) Failed in 1s

VFSB response
CPU: 1.4V CPU PLL: 1.6, FSB: 1.3, VNB: 1.25V Prime95 (Blend) Failed in 1s
CPU: 1.4V CPU PLL: 1.6, FSB: 1.4, VNB: 1.25V Prime95 (Blend) Reboot

VNB response
CPU: 1.4V CPU PLL: 1.6, FSB: 1.3, VNB: 1.40V Failed boot in windows
CPU: 1.4V CPU PLL: 1.6, FSB: 1.3, VNB: 1.55V Prime95 (Blend) Failed in 1s

Combined
CPU: 1.4V CPU PLL: 1.7, FSB: 1.4, VNB: 1.55V Prime95 (Blend) Failed in 1s

Clockgen overcharge mode: 1.000V
CPU: 1.4V CPU PLL: 1.7, FSB: 1.4, VNB: 1.55V Prime95 (Blend) last for a minute, then lock up
CPU: 1.4V CPU PLL: 1.5, FSB: 1.2, VNB: 1.25V Prime95 (Blend) 12mins without error


Q6600 495FSB X 7

Clockgen overcharge mode: 1.000V
CPU: 1.4V CPU PLL: 1.5, FSB: 1.2, VNB: 1.25V Prime95 (Blend) Fail in a few seconds
CPU: 1.4V CPU PLL: 1.7, FSB: 1.3, VNB: 1.70V Prime95 (Blend) 11mins without error

Q6600 500FSB X 7

Clockgen overcharge mode: 1.000V
CPU: 1.40V CPU PLL: 1.7, FSB: 1.3, VNB: 1.70V SB: 1.20V failed Boot in windows
CPU: 1.55V CPU PLL: 1.7, FSB: 1.3, VNB: 1.70V SB: 1.20V Prime95 (Blend) failed, small FFT pass for 10mins and going on....

Q6600 500FSB X 8

Clockgen overcharge mode: 1.000V
CPU: 1.6675V CPU PLL: 1.7, FSB: 1.3, VNB: 1.70V SB: 1.20V superpi32M passed, 4mins prime95 and then lock up.....