ok i was looking for max clock at low voltage for my 24/7 rig
i though i share maybe some looking for the same.

24/7 aircooled case
asus pw5dh
2 x 1gb mdt ddr666
intel 6420 2,13ghz @ 3,40ghzs 8 x 425
zalmann 7000
cpu voltage - 1,375v
FSB termination voltage - 1,5v
MCH chipset volatge - auto
ICH chipset volatge - auto