Yes you will with fxaa, if you add 2xmsaa it will dip under 30 fps at rare times. but mostly with 40-50 fps. Now if you get 2 7970's like I just did yesterday, you can max the game with 8x msaa and get between 35 and 70 fps. I just keep it at 2x msaa and it never dips below 50 hah. But you need a nice i5 or i7 to do so.
This is with the 13.3 beta 3 driver