I'm going through the same thing as dracon right now. I need a performance boost but I dont want to build a new machine until next year.
Right now i'm running a 1 Gig Tbird, Asus A7V MoBo, 32 MB GeForce 2mx, 384MB PC133, Soundblaster Live Value and Windows 2000 Pro SP3 direct x 9.1. I know the system is old but I still get very good performance out of it. AH II is playable but a little choppy about 20 to 25 FPS and IL2 Fb is about the same.
Now if I go and drop 150 to 200 bucks on a new Radeon 9600 or 9800 is my performance boost going to worth the money??? Or will my Model T of a processor just hold me back to much??? If you think it wont be to big of a help for my framerate I'll just save my money.