I use both (P-II and Celeron) at 450 and 433 MHz, respectively and I found out the hard way that the Celeron can do the job for a lot less. The extra cache helps out only when your O/S repeatedly asks for the same file from the HD and this file can fit within the cache. The Celeron board is also an ASUS. Make sure your memory is PC-100. ASUS makes models for the Celeron that support either the older, slower memory or PC-100. In addition to more memory, consider spending the savings on a faster/ larger HD. In IDE drives, this means 7200 RPM vs. 5400 RPM rotational speed. I've seen the IBM Deskstar 13.4 GB 7200 RPM drive (IBM rates this HD as 14.4 GB using a funky definition of a GB, but it's still a really nice drive) for $181 via mail order. And before you drool over the Ultra ATA-66 HDs make sure this standard is supported by your IDE controller. It's still really new.