[H]ard|OCP overheard that The Witcher 2 underwent a large update, to the tune of 10GB or so, which gave them an opportunity to pit the newest GPUs from NVIDIA and AMD against a game which has a reputation for being hard on graphics card.  The Radeon HD 7970 and GeForce GTX 680 both struggled equally at 2560×1600 on this game, which is quite impressive for a year old game.  The most demanding feature of the game is UberSampling, which incorporates Antialiasing and Anisotropic Filtering and can bring even these powerful graphics cards to their knees.  When it was enabled [H] saw frame rates reduced to 20fps or lower, something that the old standby Crysis just cannot do.  You can argue that a DX9 game lacks many of the optimizations of DX10 and 11 which help the performance of these cards but it would seem that as far as testing the raw graphics power of a card,

"The Witcher 2: Assassins of Kings just underwent a major update. The Enhanced Edition offers a new zone, more quests, more cinematics, and several bug fixes. This DX9 game has the reputation of being one of the most demanding and stressful games on modern video cards. We put this theory to the test."

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