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separate topic - i just managed to get a stable 400x9 overclock on my q6600 - i'm using default BIOS from last year as i dont like flashing anything so i needed 1.52v on the cpu core (1.43-1.47 measured by uguru in windows) - every other volt is pretty much at stock. The pwm temps got a bit high under 4 cores 100% load after 5-10 mins so i set case fan speeds to be controlled by this temp not cpu temp as my cpu never goes over 60. No rounding errors on prime 95.
The pwm is the power regulator on the motherboard so pushing all those extra volts through was making it so hot due to the vdroop between bios setting and actual cpu reading. By putting all other voltages back to default this seemed to reduce its load so my advice when clocking the q6600 is to just increase the vcore until you get a stable over clock and use the uguru program to monitor actual voltages in windows.
The pwm is the power regulator on the motherboard so pushing all those extra volts through was making it so hot due to the vdroop between bios setting and actual cpu reading. By putting all other voltages back to default this seemed to reduce its load so my advice when clocking the q6600 is to just increase the vcore until you get a stable over clock and use the uguru program to monitor actual voltages in windows.