Not sure, probably OCing the fsb & voltage settings & stuff, looks like your in a similar predicament as me, I have an AOpen AK77-333 board that only supports up to 266fsb CPU's, but supports upto DDR333, using the the KT333 chipset, if its possible with your board to use a barton at its native fsb, then I'd like to know how to do the same with my board, I thought Aopen was the only ones that pulled a fast one on their customers, they unofficially claimed that they would support 333fsb cpu's down the road, but then not too long back they said that they would never be able to support 333fsb cpu's on this board, for technical reasons, some sort of problem where stuff on the board would not work if running a barton on it. I want a barton, but don't want to have to get an entire new set-up & reinstall my entire OS & games & stuff to do it though.