My father in law finally got tired of the terrible image quality on his monitor, apparently an incompatibility with the S3 graphics core. His PC has a Pentium D and (I think) an ASUS P5VD2-MX motherboard. I'd like to buy a discrete graphics card (cheapest, just to get a decent 2D image), but wondering about compatibility. I was thinking of buying a GeForce 8400GS card. Anyone know if that would be compatible? Thanks.