I thought about 490FSB was tops for this board due to its LT chipset. There are boards that have done 500FSB , but I think I remember Tony stating that 465FSB was the sweet spot & over 500 yeilds a massive drop in bandwith. I intend to lower the multiplier of my 6600 "B" to 8 X 465 since its already proven stable @ 412 X 9.