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The Elder Scrolls IV: Oblivion
We turned up all of Oblivion's graphical settings to their highest quality levels for this test. The screen resolution was set to 1920x1200 resolution, with HDR lighting enabled. 16X anisotropic filtering was forced on via the cards' driver control panels. We strolled around the outside of the Leyawin city wall, as show in the picture below, and recorded frame rates with FRAPS. This area has loads of vegetation, some reflective water, and some long view distances.

We tested this one with and without antialiasing. Without AA, performance was like so:

The HD 2900 XT looks pretty good. We then worked around some AA issues in Nvidia's drivers and were able to test with AA enabled. We also added a couple of new configs: the Radeon HD 2900 XT with new alpha drivers to improve performance with AA in Oblivion and that GeForce 8800 GTS 640MB OC with its updated drivers.

Ah, the drama! The Radeon HD's new alpha driver allows it to just barely edge past the GeForce 8800 GTS 640MB OC.

Rainbow Six: Vegas
This game is notable because it's the first game we've tested based on Unreal Engine 3. As with Oblivion, we tested with FRAPS. This time, I played through a 90-second portion of the "Dante's" map in the game's Terrorist Hunt mode, with all of the game's quality options cranked. The game engine doesn't seem to work well with multisampled antialiasing, so we didn't enable AA.

AMD's new baby nearly matches the GeForce 8800 GTX here, and the 8800 GTS 640MB trails by over 10 frames per second.