Why are you running a PCI video card? I have a bunch of faster video cards in my 'misc' pile. I could sell you one if you were interested, they are all PCI-E though. (ATI 4870 1GB, Geforce 8800GT 512MB, Geforce 7950 GT 256 or 512 not sure, a Geforce GTX 260 896 MB but I think I want to keep that card for folding...)
Just the other day I fixed that 8800 and 260, in my oven!
Also, I dont think there is such thing as a Geforce MX 4000, I bet it is a Geforce 4 MX 400.