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:
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.