Why does GTA IV run so poorly for the PC?

ambam

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Jun 5, 2010
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Why does the PC version of Grand Theft Auto 4 run so poorly even on enthusiast gaming computers with multiple graphics cards?

It get 30-50 fps with two GTX 680's in SLI with everything maxed out on 1920x1080.

Also, there are also tons of buggy/blinking lights and textures as well as errors with object geometry.

This game is all sorts of messed up.