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I just upgraded from a 4400X2 to q9450 and i am getting an extra 20 fps in css so i would say the cpu was bottlenecking even my old gfx card.
Running a x2 939 at 2.9Ghz and not having any problems but thats with a 8800GTS. Only differance i notice is my 3D mark 06 score is a lot lower compared to intel rigs...though its not a game i play often
Beat quiet a few intel rigs on the crysis benchmark thread here so pretty happy.
What speed is the 4400x2 running at?