Benchmarks: Fallout 3, Far Cry 2
Fallout 3 appears to prefer ATI hardware as well and as a result the Radeon HD 4870 X2 fares quite well in this game. The Radeon HD 5870 came in second but still performed 19fps faster than the GTX 295 at 2560x1600 and 28fps faster than the Radeon HD 4870 -- which only managed 31fps so that's a huge 90% margin, mind you.
In Far Cry 2, the Radeon HD 4890 managed just 18fps at 2560x1600, opposed to the 24fps of the GeForce GTX 285. Meanwhile, the GeForce GTX 295 averaged 31fps, making it 7fps faster than the Radeon HD 4870 X2. However none of that matters much anymore, as the Radeon HD 5870 stormed home with 34fps, making it 10% faster than the GeForce GTX 295 and almost 2.5x faster than the Radeon HD 4870.