My ATI Radeon 6850 lags when playing GTA IV

My specs are:
An ATI Radeon 6850
An intel core i3 2120 3.3 GHz
Windows 7 64 bit
6gb of ram

GTA IV appears to be lagging which is strange because it doesn't lag on my other PC which has these specs:

A Nvidia GeForce GTX 650
An intel core i5 750 2.67GHz
Windows 7 64 bit
4gb of ram

So why does it lag on the first PC and not on the second?
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  1. Best answer
    Because I believe that GTA IV is heavy on your CPU. You notice the whole world in GTA IV connected and it is all loaded while you're in the game? Unlike the previous GTAs, when you cross the bridge, it will load for about 30seconds.
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