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First of all, this is probably in the wrong forum, but I will leave it up to a mod to move it.
I am not sure how you could tweak your 8600gt to be better other than overclocking it or replacing it with something faster.
However, that being said, there is a reason view distance kills your FPS, by increasing the viewing distance of the game, you are telling to the game to render things that are even further away from you, as such your PC has to keep track of more objects and your graphics card has to work harder to render these far away objects instead of simply making it a fog or something similar.
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