Recap
Although individual game results are interesting, especially when involving multi GPU systems, we calculated a performance index based on all tests with the same weight for each game. A score of 100 was given to the GeForce 9800 GTX in 1920x1200.
The index is a fine representation of the results obtained in the numerous games we tested. The GeForce GTX 280 is on average 40% faster than the GeForce 8800 Ultra and 9800 GTX without anti-aliasing or equivalent to the GeForce 9800 GX2. Otherwise, the GeForce GTX 260 is equal to the Radeon HD 3870 X2 and therefore a little more than 15% ahead of previous GeForces.
With anti-aliasing, the gaps are bigger and the new arrivals prove to be very at ease thanks to their large sized memory amongst other things. The GeForce GTX 280 thus does 70% better than the GeForce 9800 GTX and 15% better than the GeForce 9800 GX2 which is neck and neck with the GeForce GTX 260.
Note that (only) for anti-aliasing indexes, results obtained in Bioshock and S.T.A.L.K.E.R. were not taken into account as the Radeons do not have support for this filter in these games. You can consult a graph which otherwise takes these games into account
here.
