I'm still finding it hard to believe that xfired 6870'es shouldn't be enough to run GTA IV @ 1600x1050@max. I mean the graphics are hardly that amazing.
Xfire profile should be in the lastest catalyst drivers?
Anyone else been having trouble with GTA IV in a config similar to mine, and how did you solve it? (without resorting to reducing the graphics quality level)
The problem isn't your computer as much as DirectX. As you increase the view distances then you also increase the number of objects that the game has to draw. That, in turn, drives up the number of draw calls your computer has to make and is
horrifically CPU intensive under DirectX compared to the consoles. I keep the view distances relatively low on my 2500K for that very reason and can generally maintain ~60fps at 1080p on a HD6850.
I have also read that GTA4 is a game that benefits from having more than 4gb of RAM. GTA4 uses more than 1gb video RAM when maxed out (which I assume is more than is on your graphics card) and can supposedly use the additional pool. Unlike a game like Crysis, most of the game scenery isn't repeated content so that increasing the view distance also increases the memory needs.
Finally, the HD6800-series just plain doesn't like to run with shadowing on full. Night shadows
kill performance and dropping the regular shadows from maximum to medium netted me probably 15-20 fps.
So you need to reduce the graphics quality level
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