Hi, I am thinking about buying one of these graphics cards today, but will the memory on it really be a problem and will I actually have a drop in performance compared to the 640mb version?
It is not the memory size that matters. The frequency of the card manages the speed. For example, I've had a Geforce 5600 XT of 128 MB in the past. Replaced it by an ATI Radeon 9600 XT of 128 MB. That last card was much faster than the previous one.I should say, between 256 and 512 MB of VRAM would be enough for this 8800GTS.
It seems to compare very favourably in most cases, only at super high res on certain titles seem to be a potential issue. Im actually thinking of getting one myself.