Neither AMD nor nVIDIA can claim favouritism when it comes to graphical performance in GTA IV, neither card does as well as it should.  For a DX9 game that lacks antialiasing and anisotropic filtering the performance you will get from a top of the line card may disappoint you.  You can see the performance and some of the differences in graphical settings at [H]ard|OCP, not that the quality will matter too much in a high speed pursuit.

“Grand Theft Auto IV for the PC is finally here! It has a steep set of recommended system components, so we’re going to take it apart and tell you what you can expect from seven of today’s most current and popular video cards.”

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