Hi, I have a PC with XP and an AsRock motherboard 1333-667 dual channel which currently has an Intel 82945G Express Chipset. It supports Pixel Shader 2 and it cannot be upgraded. Wondered if you know how to find a compatible external graphics card which supports Pixel Shader 3? Or is this motherboard incapable of handling it no matter what I do? Thanks for your help. Ed. (ps. am new to forum and lack the tech lingo!)