I know it has a 1.0 pci x16 slot, I am planning on purchasing a GeForce GT 640 I have read that pci 3.0 is backwards compatibility to 1.0. But I am aware that that is sometimes incompatibility issues with some older boards. And that I have read on some of the manufacturers of the cards sites that they require pci 1.1.
I made a mistake. The mobo is actually 975X not 945X
My psu is powerful enough as it is 460W with 31.5 on the 12v rail. The requirements for the card are 350W with 20A on 12v rail. It meets all the system requirements. its the 1gb or 2gb GT 640 im planning on purchasing. The computer has 3gb ram and im using XP