I'm just going to say, if you want 60 frames steady or 60+ be prepared to be disappointed by one 670 @ 2560x1440 in some games. Specially newer games like BF3.
The thing is, you can always try the setup, if you like it just keep one 670, if you don't get one more later right? That is, if you have the money/motherboard/psu for it.
The thing is, you can always try the setup, if you like it just keep one 670, if you don't get one more later right? That is, if you have the money/motherboard/psu for it.