The CrossFireX tandems are very good in Wolfenstein, matching the single top-end graphics cards easily. The integrated benchmark cannot measure the bottom frame rate.
Resident Evil 5
The CrossFireX configurations are ahead of the top-end single cards in the low-quality mode and similar to them in the FSAA+AF mode. The GeForce GTX 260 beats the Radeon HD 5770.
Although the average frame rate is good, the CrossFireX configurations built out of two HD 5770 and HD 5750 cards are worse than the single HD 5870 and HD 5850, respectively, and even occasionally than the single HD 5770 and HD 5750. Indeed, the game would run jerkily on the CrossFireX tandems. Hopefully, this is a driver issue (the game is new and AMD’s programmers are known for their sluggishness). Besides, FSAA does not work on AMD’s cards in Borderlands while I could easily turn it on in the control panel for the GeForce GTX 260.
Left 4 Dead 2
The new zombie-killing game, just as the original, easily runs on the CrossFireX configurations which are ahead of AMD’s top-end cards. The GeForce GTX 260 is about as fast as the Radeon HD 5770. The latter is 12 to 29% ahead of the Radeon HD 4770.