Peerless, don't get fixated on just the physical amount of RAM. You may be able to tweak (overclock) that RAM you have, and see a difference in your pc's performance that you can actually notice. This depends on your BIOS and how much that it allows you to tweak.

If your RAM is PC100, check to see if your BIOS will allow you to set to run at 133mhz. Or perhaps you can increase your FSB incrementally by 1mhz at a time, however this capability is a longshot with an off-the-shelf system. But you could be lucky.

Also, and here is where you'll probably realize the most significant gains in performance, if you can select a CAS rating that is lower than your current setting, let's say going from CAS3 to CAS2, you'll be amazed. However, if your pc won't boot up after lowering the CAS and increasing the FSB, and you must choose between one tweak or the other, go with the lowered CAS rating, hands down.

I don't know if all that I am saying is old news to you or not, but I hope it helps.

Good luck, and I hope you can squeeze a little more performance out that dinosaur. And best of all, if you can, it didn't cost you a dime.