Originally Posted by Redeemed
I don't know the codenames for keplar very well but if you're referring to the GeForce 680, it'll be considerably faster than the 7970. nVidia does have a history of nearly doubling previous generation performance. GTX 480 was almost double what the GTX 280 delivered, GTX 280 was almost double the 8800GTX, so on and so forth. When nVidia goes from one generation to the next they are pretty good about doubling the performance.
However I'm sure AMD has a refresh in the works that'll launch not too long after Kepler's top-end part (within a month or so) that'll be able to keep up. It's going to be an odd, but interesting, year.
Thats not true redeemed. Before the big compute push by NV it was, but with the diversifying into compute, the gains are smaller. Starting with the 280, they only made 50-60% ish, and fermi was even worse, 40-50% often. All tech increases are slowing down. Even in terms of raw numbers, which are practically irrelevant to game performance, they didn't double. In fact the only real doubling we've seen has been on AMDs side, from R600 to R700 they more than doubled most of their chip and from R700 to Cypress they were pretty much an exact doubling of hardware. This gen from AMD and last gen have both been an analog to NVs 280 and 480, with more focus on compute than raw increases.