Playing gta 4 on:
Intel Core i3 530 2,93GHz
Gigabyte P55-UD3
2GB RAM OCZ DDR3 1333MHz CL7 (Turbo mode)
GeForce 8800GT 512MB def. clocks
Sorry for bad quality (recorded with N95 8GB), but as you can see, the game runs smoothly. There are places where framerate below 25, but overall it runs very good. OC this CPU @ 4GHz and it will run much smoother.