On a video card, what is the Difference between a 64-bit, 128-bit, 256-bit, etc. memory interface?
The hugher the number, the faster it will be.
The best would definitly be 256-bit, but I have a 64-bit video card and It runs Battlefield 2, so 64-bit can't be that bad.
A 128 bit card is good. A example is the 6600GT. A 256 bit card is even better, like a Radeon X800 series or a Nvidia 6800 series.
Like someone said, the higher, the better.