Recap of performances
Although individual game results are interesting, 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 8800 GTX in 1920x1200.

These scores effectively represent results obtained in numerous games. We can see the GeForce 9800 GTX is roughly equivalent to a GeForce 8800 Ultra without anti-aliasing and a GeForce 8800 GTX with this filter. Compared to the GeForce 8800 GTS 512 MB, there is an average gain of 8%.
Note that results from Rainbow Six : Vegas, Bioshock and S.T.A.L.K.E.R. were taken into account here and therefore Radeon scores were affected by the 0’s obtained in these games.

In DirectX 10, and therefore with games / options that are generally more demanding, the GeForce 9800 GTX showed lower performances and thus finishes between the GeForce 8800 GTX and Ultra. On the other hand, with anti-aliasing it is significantly behind the GeForce 8800 GTX.
Note that results from Bioshock were taken into account here and therefore Radeon scores were affected by the 0’s obtained in these games.