Asus 670 DC2t vs EVGA 680 sc

What's the difference between these to cards what's is the frame rate difference.

the asus GTX 670 will be a better OC card due ti the dual fans but the 680 is already OC and its a 680 vs a 670 the 680 can be OC more than what it is shiped with and you will see better FPS in games with the 680 over 670.