You're confusing drive spindle speed (the rate at which the drive platters spin) with IDE (ATA) bus speed. It doesn't matter if you put a 5400RPM drive or a 7200RPM drive in...the motherboard can't tell the difference. It just sees a drive. Now, for ATA66/100/133, the motherboard can tell the difference in those. That is the speed at which data is transferred. I think you'd want at least an ATA66, but you can use a faster drive, but the machine won't take advantage of the extra speed. It'll just cost extra. (maybe). mark ----- Original Message ----- From: <lavode at attbi.com> > My last question (for now) is regarding the hard drive. Does anyone know what > the specs are for it? When I upgraded my wife's iMac, I learned that her > computer ran on an IDE 5400 rpm. I would want to make sure I get at least the > same speed hard drive. What is the maximum speed the Sawtooth mobo can use? > > Thanks! > -Lavode