Oblivion
We saved a specific movement in order for it to be always identical and the test reproducible. Of course, HDR was activated.
Given that Oblivion is very dependent on calculation power in HDR mode, the GeForce 8800 GT places close to the GTX, the GTS 512 surpasses the Ultra, and the Radeon HD 3870 finishes with the Radeon HD 2900 XT.
Once FSAA 4x is activated, the 2 Radeon HD 3800s surpass the Radeon HD 2900 XT (especially the 3870 which is ahead of the GeForce 8800 GTX). The 8800 GTS 512 and Ultra are on top.
