ok well this is where I'm at. somewhere around 420 host clock I hit a wall, which seems pretty low to me, but maybe its a power supply issue.
currently im at 413 and stress tests pass.
cpu is at default (1.325 v)
fsb is 1.75
MCH is 1.225
6x multi

When it was at 420 host clock, first I raised FSB twice to 1.3, didnt work. then raised the mch one notch, didnt pass, then raised it again. still no go. so i upped the core voltage which didnt help either. where should i go from here?