stark21 :
I currently am running a MSI gtx 560ti hawk edition card, with a I7 2600 and 16gb ram 1600 speed.. I am looking to upgrade the GPU and would like to stay around 300 dollars.. I can get a asus 660ti for 279 would there be any performance gain or with my current setup I would see much gain. thanks.
with your setup, yes you would see a great difference. Depending on the game it can be as much as 50% increase. That percentage will vary from game to game, so I would say average of 30-40% better. Plus the added benefit of 2gb + vram will serve well on a nice monitor. With your 2600, you will have nice FPS with a 660ti. It will play most games at 1080p on high/max settings with the exceptions maybe being FC3, BF4, Crysis 3, which will be more demanding. Still if your struggling after that, you could pop in another 660ti, SLI them, and have an awesome rig.