PIII 133 with PC100 memory?

Pc 133 will work at 100 its backwards compatable

But pc 100 will not work at 133

I think u will be fine thou

Your 100 MHz bus will work fine with 133 memory
the 133 mem will just run at 100

a-ok

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Unfortunately, whilst you can have the memory running at 133 with a CPU running at 100, you can't do it the other way round (mem @100, CPU @ 133). Saying that, you may well find that the PC100 memory you have will run at 133, though there isn't a way that I know of of telling for certain (if you can let us know the make of the RAM, and possibly a serial number, there may well be guys here who could tell you whether it'll work or not - I've used various makes of PC100 @ 133 without problems in both PIIIs & Athlons)

Best to allow funds for new RAM, buy the processor & plug it in. If the existing RAM is okay, you've saved some cash, else replace the RAM also, and sell the old stuff

Hope this helps.

You can run your FSB at 133 and your memory at 100 with the Asus CUSL2 and many other i815E chipset motherboards! the 815E is the only chipset I've seen for the PIII that will support this. The case is opposite for the Athlon chipsets, which allow you to run 133 memory speed at 100FSB.

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