S.T.A.L.K.E.R. - Clear Sky
S.T.A.L.K.E.R.: Clear Sky, is the stand-alone prequel for S.T.A.L.K.E.R.: Shadow of Chernobyl, a first-person shooter computer game by Ukrainian developer GSC Game World. The game consists of a roughly 50/50 mix of new areas and old, remodeled areas from the previous game. The X-ray graphics engine has been updated to version 1.5 and includes DirectX 10 support (later patch 1.5.06 included DirectX 10.1). Additionally, the AI received an overhaul to accommodate the new faction wars feature.
HD 5870: The minimum FPS is a bit all over the place here; we continue to be above 30 FPS at the lower resolutions which is the main thing.
HD 5850: In the minimum department we manage to see a nice little boost, but more importantly we break 30 FPS at 1920 x 1200 in the minimum result.
HD 4890: Here we see no real change.