FEAR seems to like to be run at 1024x768. Anything above that causes problems, and requires a 7800GT or higher and will still get choppy in places. This really sucks for LCD users who require to play at 1280x960 because of the native resolution problem.
The developers of FEAR had no respect for the market. Just a little bit more optimization as well as removal of unnecissary shaders would have FEAR running a whole lot better. I hope Unreal Engine 3 doesn't have as much disregard for the market as FEAR had.
C'Mon, Sierra, you can't expect everyone to have a 7800GTX and code your games as if everybody does.