Récapitulatif
Although individual game results are interesting, we calculated a performance index based on all tests with the same weight for each game. An index of 100 was given to the Radeon HD 4870 at 1920x1200.
On average then we have a Radeon HD 4890 that is 10% faster than the Radeon HD 4870, whatever the graphics mode. Without antialiasing it gives identical performances than the GeForce GTX 260+ and betters it with the filter activated.
The positioning of the Radeon HD 4890 opposite the NVIDIA offer is more complex. Although it is 10% up on the GeForce GTX 260+ without antialiasing, it is bettered by the GeForce GTX 275 and 280 on several points. 4x antialiasing allows it to inverse these results and 8x mode gives it a real advantage that even places it in front of the GeForce GTX 285.
The GeForce GTX 275 gives similar results to the GeForce GTX 280. A little better without antialiasing, identical in 4x mode and not as good in 8x mode, which is logical if you look at the spec and main demands of these different graphics modes.
