Despite the OpenGL-based game engine and enabled FSAA, the Radeon X1950 Pro is preferable to every version of GeForce 8600 GTS. The average speed is low, however, so you cannot play the game comfortably with 4x FSAA and at the maximum level of detail.
S.T.A.L.K.E.R.: Shadow of Chernobyl
The game doesn’t support FSAA when you enable the dynamic lighting model, but loses much of its visual appeal with the static model. So, we benchmarked the cards in S.T.A.L.K.E.R. using anisotropic filtering only.
The GeForce 8600 GTS suffers a heavy performance hit with the new driver settings whereas the Radeon X1950 Pro stays on the same level. This must be some flaw in the ForceWare driver or the consequence of our enabling transparency antialiasing. The game is not very fast on the Radeon, yet it is quite unplayable on the GeForce 8600 GTS.