I'm getting what seem like shockingly bad frames per second when playing a number of games. The most recent example would be Team Fortress 2 - with the rig below I average roughly 65-75fps @ 1680x1050, max AA/AF/textures etc. - my friend who runs the game with a gigabyte x58 mobo, the i7 920 and a GTX295 gets 500~...........why? how?!
well for a start i think steam games are locked at 300fps but i could be wrong. i say this as all the gc simulators u can run on games like half life max out at 300fps.
i am suffering from the same problem as you. i got a 4870x2 and i was getting over 200fps at the same settings as you but now im getting at max 60fps, the only thing thats changed is my drivers for my gc so that leads me to believe its a graphics driver problem. wait till the next lot of drivers come out and give that a go and see if that improves anything.