Hi all, thanks for the help. I'm arynn's brother (the one with the Aspire) This thread has been very helpful and has confirmed research I have dug up from other sources. As far as I can tell, I am running Intel 440bx chipset...board is marked V66M, although I can't find any definitive info on the manufacturer or any other board specs. The fsb speed is either 66/100 (depending on processor). I have dip switches to adjust multiplier from 2 - 5.5, although the point is moot since the PIII's are locked. I think I will be fine with a PIII slot 1 at 100 Mhz fsb. I'm looking at PIII/850 Mhz. The only thing I'm not 100% sure of is the lower voltage requirement of PIII's. Research I've been able to dig up so far indicates that PII and later boards have a voltage regulator built in, so the CPU will only draw its required voltage. My understanding is the earlier PII's drew 2v and the later PII's draw 1.8v, and PIII's around 1.65. Still looking a bit further to try to determine if this is the case for sure. Thanks again for all the help.