Nothing major really: XP1800+ at 1.53Ghz, 768mb DDR333 RAM, ti4400 128mb. Normally get around 40-50 fps consistent on all maps, obviously increasing or decreasing slightly depending how intense the map is (Chrome vs December for example), and that's with all details maxed and the additional stuff like projectors enabled
But since Fraps adjusts your ingame framerate to whatever you are capturing at, it doesn't make a lot of difference what details you're running, as long as your machine can handle the fps you've set in fraps. I normally capture at 15fps, so the game will run at 15fps for as long as I'm capturing. I've tried 30fps which runs better (and is therefore easier to play) but when you play the video back it looks like you were playing at 150% speed. 15 or 20 fps is good normally, and doesn't take as much space.