A lot of that has to do with the game engines, many for years have already been optimized for NVidia and even with changes to make them more optimized to AMD, they are still going to have some of the NVidia optimization still on board. Honestly in the case of recent game from what ive been seeing in performance, the current scenarios are the way I think it should be because of how close all the games are starting to get. It really is nice that gamers no matter what their card choice is can play a game on par with the other side, its not longer a choice that can harm your experience with other game companies.
On the R9 290, wow the performance is so close to the 780 and 290X is shocking to say the least, I actually did not expect them to be within 5FPS of eachother like that. Im still waiting on the 290X, but I noticed that the 290's are in stock on newegg and that's very tempting. Still think ill hold off and try for the X versions.
Great review.