I'm running Win7 64 with twin 5850 in Xfire and phenom II 955 at 3.5Ghz with 8GB 1333 RAM. I'm getting about an average framerate of 35 or 40 in most multiplayer maps, and it often dips into the 20s on Skyline and Pier 17 even without explosions or gunfire around me. The framerate drop is completely random, I could be overlooking the entire map or at a wall and it would still have drops into the 20s. This choppiness really hurts my aim and manuverability when someone does jump out in front of me, and it's made the whole gameplay feel sloppy.
I'm currently running all graphics settings on 'very high' and post processing on 'custom' due to ATI Xfire. I have everything turned off in background and I always have ping of 100 or below.
What framerates are you people getting?