thank you very much!!!please give me and some suggestions too......
I'm currently running an i5-3550 with the EVGA GTX 660ti SC GPU that I purchased last week. I only own 2 games for the time being, but Crysis 2 at 1920x1080 resolution on "hardcore" video settings runs very smooth and flawlessly. Borderlands 2 runs at 1920x1080 res at 60FPS with everything maxed out except PhysX at low. Very smooth gameplay with Vsync.
I understand the 660 isn't much weaker than the 660ti, so I'm sure it'll run most games on decent settings. If you have extra money, I'd look into at least a 670.