Left 4 Dead
The game runs on the Source engine and has an integrated benchmark, but the latter does not report the bottom speed information.
The GeForce GTX 285 is as fast as the Radeon HD 4850 X2 at the reference frequencies whereas the pre-overclocked version from EVGA offers even more performance. The performance growth isn’t as high as to affect the gamer’s experience, though. Anyway, it is clear enough that single-chip graphics cards can challenge multi-GPU solutions as yet.
S.T.A.L.K.E.R.: Clear Sky
To achieve a playable speed in this game we disabled FSAA and such resource-consuming options as Sun rays, Wet surfaces and Volumetric Smoke. We use the Enhanced full dynamic lighting (DX10) mode for our test and additionally enabled the DirectX 10.1 mode for the ATI cards.
It is all different in Clear Sky: the pre-overclocked EVGA cannot compete with the Radeon HD 4850 X2 at resolutions above 1280x1024 even though the gap is only really large at 2560x1600. ATI’s solution is unrivalled in the highest display mode, being the only card to ensure a more or less acceptable bottom speed.