The Elder Scrolls IV: Oblivion
The Elder Scrolls IV: Oblivion, or simply Oblivion, is a single player fantasy-themed action-oriented computer role-playing game developed by Bethesda Game Studios and published by Bethesda Softworks/ZeniMax Media and the Take-Two Interactive subsidiary 2K Games.
Oblivion's story focuses on a former prisoner drawn into a Daedric Lord's plan to invade the mortal realm of Tamriel. Gates to the hellish realm of Oblivion are opened, through which many daedra flow. The game continues the open-ended tradition of previous Elder Scrolls games, allowing the player to travel anywhere in the game world at any time, including the option to ignore or postpone the main storyline indefinitely.
When Oblivion was released in spring 2006 we had found a new system benchmark, the expansive gameworld of Oblivion required a hefty configuration if you wanted to play it at the highest detail level. Not only did it tax the video card, the CPU was quite important too.
Oblivion was once able to bring any system to its knees, in our tests neither graphics card goes below 60 FPS, even with 16xAA enabled. The HD 4870 X2 has a comfortable lead over the GTX.
The performance of Oblivion under XP is pretty much on par with the numbers under Vista; NVIDA gains ~4% overall, ATI loses less than half a percent.
For a detail view of the results, with AA scaling and XP -> Vista Scaling see this table