I had to sacrifice some other settings to use 2xAA and the Antialias A-tested objects for DX 10.0 (my GTX 275 doesn't have DX10.1). I had to turn off Vsync in game and force Vsync on in the Nvidia Control Panel to make Vsync work (had unbearable tearing without it). Now that I have Win7 instead of WinXP, using the DX10 settings was new to me. Almost all weapons can be upgraded but do make a good choice among comparable weapons. So it wil be a good idea to collect some money early in the game, and get good upgrades. That thread also includes a full user.ltx of some really extreme graphics settings which made my poor GTX 275 crawl on its lips - you could probably use it with a GTX 485 or two. Unlike Stalker: SOC we can upgrade our weapons in clear sky, this can be done at the duty base (there may be other location but I hv not been that far). I experienced a bit of the sun shadow problem, so I fiddled with those settings in the user.ltx, and made it look really bad (which looks like this), but fortunately I found the correct settings in this thread: (Increase sun_near_border to 1.1 or 1.2 or more as needed for extremely wide displays.)

Referring to my SOC thread, here, I found that the shadow glitches are still the same as in SOC, and fixing them is also the same as SOC, by going to the user.ltx file and making these changes: I expect to play it through once with the Complete mod and that will be that. I have finally got around to installing and trying out Clear Sky, and there is not nearly as much to report about it as there was for SOC.

Stalker clear sky complete