Whatever, just got a 2GB Corsair memory stick. 800 MHz, and it fits. Closed up computer, plugged in everything and such. Tried it out, and it didn't boot. Not even from a Windows CD. No beep either.
Read the manual of the motherboard, and it turns out we have to have 2 memory modules for it to work.
Means I gotta go chip out another 2 GB and dig in my savings :c
Ah well, 64-bit Vista here I come!