The 400 to 500 conversion does not involve the bus speed. My 4/500 is still at 100Mhz bus. I'm not sure if the published methods for increasing the bus speed apply to the Rev. A's. Besides. There's a point at which it just becomes greedy. :-) On Sunday, Jan 05, 2003, at 07:38PM, Luke <etyrnal at ameritech.net> wrote: > >On Friday, January 3, 2003, at 05:27 PM, Dave Friesen wrote: > >> Soldering iron, steady hand, big b at lls. :-) >> >> You need to remove a surface mounted resistor and bridge another >> connection. It's not hard but it ain't easy. Don't mess with it unless >> you practice removing *very* small components from a circuit board >> first. Too much heat and you can very easily fry your motherboard. > >Did you up the bus speed to 133 too?