I wouldn't buy a 3gb card. I have hit 3gb usage on my 780 (3gb) while running 1080p in 3 games so far, it causes instant stuttering. Ok its very easy to fix by reducing a few settings but its clearly a limiting factor and with games continuing to want more and more vram I just don't think its enough for a current gen card which you would expect to run games for the next few years at least.