i have a Dimension 4500 1.8Ghz, 400mhz fsb, 512mb ram. i was hoping to get a 6600gtagp but the only place that has it is newegg (last time i checked they ran out and i think the price was ~$220 and now is $245, it doesn't even come with that molex splitter cable :smileymad:  so i was thinking of just getting a plain 6800. i need to know if my computer might limit the performance of the 6800, since its kind of a high end card (don't want to waste too much money). suggestions of other video cards would help. thanks