Originally Posted by james888
The most I have seen is 1.2gb of used vram, at least that I while I was monitoring. Natural selection 2 is the only game I know I have hit that high because I am always monitoring during that game.
Most of the games using the R.A.G.E, Dunia2, Frostbyte2 or the 4A engines are all benefit from more video memory (but iirc the biggest number I saw was with a modded Skyrim which maxed out 3GB all the way).
However the speed difference compared to 1GB cards is usually not that great (5-10% most of the times), and only the min fps is what suffers the most (more and greater fps drops with less VRAM).