DDR-RAM is SD-RAM with double date rate. DDR-SDRAM is the official name of DDR RAM; people get that confused quite often. Regular SD-RAM simply won't work in your PC, however. You'll need at least PC2100 RAM, even though there is potential issues with decreasing the RAM bus that much lower than your processor.
You can find cheap insta-DDR on the Internet fairly cheap. I think 256 MB of PC2100 is like $50 max. I'd get PC2700 just to get closer to the performance you need for that processor, though. Actually, if it were me, I'd wait and get 2x 256 MB Corsair or Kingston like you mentioned. PC3200 would be great. Two sticks will take advantage of the one feature Intel has over AMD: dual channel memory. The performance would increase dramatically over a single 512 MB stick.
Like I said before, you need DDR RAM, but I wouldn't risk buying anything below PC2700. If it were my computer, I wouldn't buy temporary RAM at all. I'd just wait and get two 256 MB sticks of the Kingston you were talking about.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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