Left 4 Dead
The game’s integrated benchmarking tools are far more accurate than Fraps but cannot report the bottom frame rate.
A single Radeon HD 5770 will suffice for this game but you can unite it with another Radeon HD 5700 series card to get the performance of a Radeon HD 5870 or even higher (if you add in a junior or senior model of the series, respectively). What is important, the power consumption and noise of such a graphics subsystem are going to be within reasonable limits.
S.T.A.L.K.E.R.: Call of Pripyat
We use the highest settings in the new S.T.A.L.K.E.R. but without antialiasing. We turn on the DirectX 10.1 and DirectX 11 modes products that support them.
The symmetric Radeon HD 5770 CrossFireX tandem is the only opponent to the Radeon HD 5870 here. The cheaper asymmetric tandem with a Radeon HD 5750 is a little worse, but we should note that the bottom speed of every tested solution sinks below comfortable as soon as 1680x1050.
The game was tested in OpenGL-based multiplayer mode. Unfortunately, the integrated benchmark cannot report the bottom frame rate.
There is almost no difference between the asymmetric Radeon HD 5700 CrossFireX configuration and the Radeon HD 5870, and neither can compete with the GeForce GTX 295 at resolutions of 1920x1200 and higher. It must be noted that AMD’s solutions are fast enough even at 2560x1600 to ensure comfortable and smooth gameplay.