Been playing around for awhile trying to get the maximum oc I can with my Q6600. In coretemp shows the VID is 1.325V. The maximum oc I can get without pushing the volts past 1.6v (brave enough to push it that far I reckon) is 3.699GHZ at BIOS setting 1.5625V at multi x9 @ 411 FSB. Wanted to get to 3.8GHZ but no cigar. The graph indicates the minimum stable voltages for each incremental overclock.