Cool and quiet automatically lowers the cpu fsb and voltage on most cpus. You don't need to lower the bios settings. It does a better job of selecting the right settings to save energy than if you do it yourself.
Disable "cool and quiet" first. Then lower your ht setting by 20% examles: if the default is 5, set it to 4 for the multiplier, or if it's 2000, set it at 1600). Set the cpu voltage at 1.4, no higher. Then enable acc. Good luck.
i have a similar request. i would like to underclock my i7-920 temporarily to play some games without overheating since my hsf is supposedly defective, so im waiting for my cooler to arrive. while waiting, could i underclock my i7-920 with asus p6t motherboard to lower cpu temps?
No need to. Cool and quiet will lower the voltage setting for most applications. Gaming will stress your cpu no matter what settings you use. Limit your gaming time to maybe 30 minutes at a time until the heatsink arrives, or monitor your cpu temperature with coretemp. Your cpu won't suffer any long term damage up to about 70c for short periods of time.