Half-Life 2: Episode Two
CrossFire technology provides a performance gain of 31-32% at 1920x1200. Not much, but enough for the Radeon HD 4850 subsystem to match the GeForce GTX 280 in terms of average performance. The ordinary single Radeon HD 4870 delivers a similar result, though.
It’s somewhat different at 2560x1600. The Radeon HD 4870 loses its ground, being about 25% slower than the Radeon HD 4850 CrossFire while the latter solution remains on the same level with the GeForce GTX 280, showing identical potential at a lower price.
S.T.A.L.K.E.R.: Shadow of
The game doesn’t support FSAA when you enable the dynamic lighting model, but loses much of its visual appeal with the static model. This is the reason why we benchmarked the cards in S.T.A.L.K.E.R. using anisotropic filtering only.
ATI’s multi-GPU solutions have always been fast in this game. The Radeon HD 4850 CrossFire is not an exception. This subsystem is roughly similar to or somewhat slower than the GeForce GTX 280 at resolutions up to 1920x1200 inclusive. The gap grows to 8% at 2560x1600 but the CrossFire subsystem is fast enough for comfortable play.
SLI technology doesn’t have good support in this game. The GeForce 9800 GX2, potentially faster than the GeForce GTX 280, has unsatisfactory results. The developer has obviously abandoned the previous-generation solution in favor of the new series just as he had done with the GeForce 7950 GX2.