Legit Reviews has posted performance numbers from the new AMD Catalyst 12.11 drivers. There are some decent gains that give them a bit of a boost, and in some cases let the 7970 overtake the 680.
When it comes to the AMD Catalyst 12.11 drivers we are impressed that AMD was able to get such a nice performance improvement across the board. AMD's Graphics Core Next (GCN) GPU architecture was introduced in December 2011, so we honestly figured that AMD had already wrangled all the performance the could from it. We were told from AMD that it took this long to really look at how the new architecture works and to fully utilize everything in there. The AMD Catalyst 12.11 driver gives a noticeable performance boost in the vast majority of the game titles that we tried it out. We have no complaints there and it doesn't appear that AMD is doing anything fishy to get the performance boost. We looked for image quality differences and renamed the executable file for 3DMark11 and other benchmarks. No differences were seen when looking for known exploit methods, but you never know. You'll be able to download these drivers later this week and try them out for yourself and we highly advise in doing so.