Originally posted by: JPB
Compare the benches in the link I posted. The SLI 320's are clearly faster at any resolution in certain games.
"in certain games" sure, but "in certain games" it may be clearly slower; not all games use > 320mb frame buffer. my lcd native res is 1680, and having both a 320mb and 640mb GTS in some games the lack of the additional memory is very noticeable.
i also keep hearing of upcoming DX10 titles will require more ram due to not only textures, but longer shader instructions, etc., so imo the 320mb is great if you're running 1280 or 1440, decent if you're running 1600/1680, and not so good running higher. SLI doesn't make up for this lack of frame buffer. in DX10, there may likely be more titles that are sensitive to the amt of ram in the frame buffer.
so i would still recommend a single GTX, unless you wanted to SLI 2 640mb GTS, where the results would be much more interesting.
and the degree of difference in those benchmarks is hard to say as they don't compare a single GTX.