I don't know what you mean by acceptable FPS, my acceptable amount is solid 60 FPS with a maximum slowdown of 45, which is what I get with 16x AF and around 8x AA, all on high or very high in Alien Vs Predator, BioShock, Stranglehold, Street Fighter IV, Devil Mat Cry IV, Left 4 Dead 2, Borderlands and almost any game, except of course GTA IV, where frames go from 55 to 30 all on high, but with shadows off.
If acceptable frames for you is 20 or 30, which would only give you a choppy and stuttering game, then yeah GTA IV runs good in a Core2Duo, only 2 GB of RAM, and a 8600 with 256 mb. Maybe on low and no view distance at all, or in medium with those flickering low shadows, but if I'd like to play an ugly looking and slow version of the game I'd get an XBOX 360 or a PS3. I still say, 4GB's of RAM, a QuadCore or Phenom II X3 BE, and any GTX/ HD4/5 GPU with 1 GB of memory, as minimum to run it smoothly. .C. -- 9xx SOLDIERS SANS FRONTIERS
