just to follow up on what I found out here and other places. RAM seems to be backwards compatable, provided is it the same type...SDRAM, DDR, DDR II.... You can use a faster RAM in a slower machine and the RAM will just clock to the slower speed. In my case, I had RAM at 533 mghz, and put it in a machine designed to use 400 mghz. It runs just fine, but clocks at 400 mghz. In some cases in might not matter, like with 100 SDRAM and 133 SDRAM. I know these are basically the same and will run in any machine designed for either. The 133 just gives you a performance boost.

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