Are you sure It's a micro ATX case/PSU? a lot of the big manufacturers use weird generic mobos/cases... for instance, DELL wire their power supplies strangely, so a Dell PSU plugged into a normal ATX mobo will fry it, and Compaq Pcs are never remotely standard...
That said, It'll only cost 30 bucks more for some Crucial PC2100 DDR RAM, and the performance benifits would be enormous. plus if you get some DDR ram, your choice of motherboards is much larger.
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