The PowerColor HD 2600 Pro 512MB is lagging behind here, but it’s not really important as its average frame rate is only 15-17fps. You should have an Nvidia GeForce 8600 GTS or something better for playing this game comfortably.
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. This is the reason why we benchmarked the cards in S.T.A.L.K.E.R. using anisotropic filtering only.
The results are even lower in this game. You can’t play it with the dynamic lighting enabled. Disabling it is the only way to increase the speed of the ATI Radeon HD 2600 Pro to a more or less acceptable level.