@BHD
And your source is? Not that I don't believe you or anything,but 7970 is ~34% faster than 580GTX in 25x16 with 4xAA/16xAF. In order to be 45% faster than 7970,single GPU 680 needs to perform around 1.93x better than 580GTX which even though is not impossible ,is highly unlikely. You have 2x the "stream" processor count but you have roughly the ~2x less shader clock which is now in sync with the rest of the GPU. You have almost 84% more memory BW though so there is close to enough of it for this to be true. But SPs have to be massively more efficient to net such a huge gain over GF110.