72 Pin Sims / Celeron

72-pin simms are not hard to get a hold of... you can find them online very easily. http://www.baber.com/baber/products/memory72.htm
Remember that these need to be installed in pairs though. ($6 for 8MB to $50 for 64 MB).

Celeron chips have less cache memory than Pentium 4 chips do. A Celeron might have 128 kilobytes of L2 cache, while a Pentium 4 can have four times that. The amount of L2 cache memory can have a big effect on performance. You'd need to compare the amount of L2 cache ina Celeron 333 -- with the amount of L2 cache in Pentium processors in order to determine equivalence.

I wouldn't pay any money for a Celeron 333 today, but I'd take it free. By today's standards the computer is old. It's be a good computer for linux or word processing.... but not for much else.

72 Pin Simms are a form of RAM that was very common in the 486/early Pentium time frame and gradually were replaced by 168 pin Dimms. Some motherboards even supported both for a while. They are harder to come by and more expensive (because of being less common now), but not difficult to obtain. Also, you can easily pick these up inexpensively on E-bay.

The Celerons are basically a "budget" PII (though they have their fans because they supposedly do well with overclocking). The 333 was a much better incarnation of the Celeron because it did not leave out the L2 cache like on the early models. I have heard of them being overclocked to 500+ mhz as well (though I have never been an overclocking fan).

Here's a great article in PDF formatfrom HP about the Celeron and its performance levels. Hope it helps!

http://www.hp.com/desktops/library/pdfs/celeron.pdf

Delete any spaces in the URL.
Good luck

72 pin simms are findable especially at recyclers and small mom pop shops. Q computer @www.quecomputers.com has them for 8meg for $5, 16 for $10 and 32 meg for $20. Are you sure it's using 72 pin and not pc-66 168 simms? celeron are generally 7% slower than their rating so it's just faster than a 300mgz pentium II
(333-23.33=309.67). Remember 72 pins are installed in pairs so you may be throwing away simms to upgrade.
Good luck