Far Cry 2
The new dual-processor cards are close in performance in this rather old game. There is no practical difference between the frame rates of 144 and 148 fps, for example.
BattleForge: Lost Souls
We see some fighting in this real-time strategy: the Radeon HD 6990 wins in the FSAA-less mode whereas the GeForce GTX 590 goes ahead when FSAA is turned on. AMD's dual-processor card is quite competitive to the CrossFireX tandem of two Radeon HD 6970s but Nvidia's new flagship is again inferior to the two GeForce GTX 570s in SLI mode (except for the high-quality mode at 2560x1600 where the two solutions deliver the same performance).
Resident Evil 5
Resident Evil 5 seems to be the first game on my list where the green team is unrivalled. The GeForce GTX 590 is so good here that its performance in popular display modes is comparable to that of the two GeForce GTX 570s which have higher clock rates.
S.T.A.L.K.E.R.: Call of Pripyat
Nvidia is faster in S.T.A.L.K.E.R.: Call of Pripyat. AMD fans have to content themselves that the new Radeon HD 6990 is as fast as the two Radeon HD 6970s with higher clock rates.