I managed 525fsb without really trying hard at all. x6 or x9 multi made no difference, which also meant I whooped my 10.062 1M pi time by about half a second. I almost booted at 540 and got just past login before it hung - once again, this was without really trying at all. I'm almost certain I could be looking at a benchable 550FSB+ with this CPU and board. I might have a good stab at it with the reapers tonight