The frame rates in the multiplayer modes are not the most stable I've seen, but the game's detail options are pretty robust so you should be able to find a detail level to your liking. The minimum requirements aren't nearly as steep as some have speculated, requiring only a low-end Athlon XP or P4. Anything equal or better to a Radeon 9600 or GeForce 5700 are supported, although a somewhat steep 1GB RAM is the minimum - still, this is pretty good considering many recent games' requirements. The Recommended system is quite a bit more steep, so if you're serious about S.T.A.L.K.E.R., try and get to at least a 7000-level GeForce or ATI X1000-level video card, 3GHz+ CPU, and possible 2GB RAM.
S.T.A.L.K.E.R.: Shadow of Chernobyl - tactical team 3D action game which is partially based on "The Roadside Picnic" book by Strugatsky brothers, Stalker movie by A.Tarkovsky and the history of Chernobyl atomic catastrophe (1 (2423 hits) S.T.A.L.K.E.R.: Call of Pripyat - continuation of GSC Game World's shooter series (812 hits)