As an example, here is a PhIIx2 unlocked to a Deneb quad at load using minus 0.125 ...
At load, total system power at the wall dropped from over 180w, to 134w.
Your motherboard has SB700, so AOD will not work for you. There is a utility called Phenom MSRTweaker, which should, however, work.
It allows you to set individual P-States CPU multipliers and voltages.