Ive got a 64bit motherboard..... the graphics card ive got right now is a 64bit so ive got no doubt that is compatible. I was wondering if I upgrade my graphics card to a 128bit or 192bit would that still be compatible or does the motherboard & graphics card even need to match..... I know I know..... probably an easy question but being as how im a "nooby"... I understand all the specs which to other stats interact other than motherboard to GPU! where must I start to upgrade this graphics card.....? must start somwhere right.....?