OK guys, i know how to set the fsb and multiplier but one thing that is confusing me a little. I just bought a xp2400+ 266mhz fsb and runs at 2ghz. In the moboard settings, i change the fsb to 266mhz and set the multiplier to 7.5 so it gives me 2ghz BUT when i do that, the pc doesnt want to boot and the only way i can get it to boot and see it as a xp2400+ is if i set the fsb at 133mhz @ 15x or 166 @ 12x. WHy cant i run it at 266mhz @ 7.5x ??? Am i getting mixed up with something ??? I have put together a few pc's and i have always wondered about this.