Colin McRae: DiRT 2
After a series of failures of CrossFireX technology, the Radeon HD 6870 and 6850 tandems improve. They deliver a performance growth of 90%, just like the GeForce GTX 460 SLI does. The GeForce GTX 460 and its SLI tandem is somewhere in between the HD 6850 and HD 6870 (and higher when it is overclocked). When overclocked, the Radeon HD 6850 gets closer to the HD 6870, the gap shrinking from 15-30% to 6-8%.
Metro 2033: The Last Refuge
CrossFireX is highly efficient in this game, too. It improves the frame rate by over 90%. However, the results of the individual cards and multi-GPU tandems are not as high as we want. Metro 2033: The Last Refuge calls for more advanced graphics solutions or lower graphics quality settings. Overclocking makes the Radeon HD 6850 as fast as the Radeon HD 6870. Likewise, the overclocked GeForce GTX 460 SLI equals the Radeon HD 6870 CrossFireX.
Just Cause 2
Just Cause 2 is yet another game where CrossFireX technology is highly effective. The CrossFireX tandems enjoy an advantage of 95% and higher over the respective single cards. As for SLI technology, the GeForce GTX 460 tandem is 88 to 94% efficient, which is quite good, too. The Radeons are overall faster than the GeForce series products in Just Cause 2.
Aliens vs. Predator (2010)
Aliens vs. Predator agrees with the previous game that CrossFireX technology is highly efficient: the Radeon tandems are 92 to 100% faster than the respective single cards. SLI technology is less effective at 86 to 92%. At the reference frequencies the GeForce GTX 460 is comparable to the Radeon HD 6850, the Radeon HD 6870 being somewhat ahead of them both. Aliens vs. Predator is only playable on these SLI and CrossFireX configurations at resolutions up to 1920x1080 if you turn on full-screen antialiasing.
Lost Planet 2
CrossFireX is 100% effective again. This time we see such results in Lost Planet 2. SLI technology is good enough at 90% efficiency, but still inferior to CrossFireX. The overclocked GeForce GTX 460 SLI is ahead of the Radeon HD 6870 tandem.