Sorry, but you searched wrong. Perhaps we not spoke about an oc model, but we spoke about the 660ti. Even it has enough vram for now, the vram interface is very low end at all new cards. Even a 580 is more sufficient. I just said, that you should read about 660 cards first before buying. It would be helpful!
You should state your resolution. I would say: even at 1080 p, which is a normal resolution, you would never ever get constantly over 50fps in this setup! Even on lower res I doubt, because at 1080p, even the best single cards will sometimes drop down to 30 fps!
And that is constant fact!
There are also players in bf3 singing about 60fps all maxed out, but they are also proven wrong. In the benches only 2 cards hold up over 50 fps. And these are the top cards and noone else. Fact!