Official slide puts it against HD 7970/7950
official GTX 680 performance slide has leaked online and it looks like Nvidia is quite confident, perhaps even cocky. According to the slide, Nvidia's GTX 680 is over 40 percent faster than HD 7970 in Battlefield 3.
Of course, we are talking about an Nvidia slide here and this is most likely the best case scenario, to put it mildly. There are no details regarding drivers that were used or even resolution on which these couple of games were tested. The most impressive lead scores of over 40 percent and over 20 percent are in Battlefield 3 game when 4xAA is used and in Dirt 3 with and without AA.
According to what we heard earlier, the GTX 680 is indeed faster but only in some games. Of course, we just need to wait for some official benchmarks that will put these bold Nvidia claims to test. The slide came from NGF Community forum