Askadaffer: looks like you have anti-aliasing on, and that doesn't look like coverage samble (CS) anti-aliasing either. If you set it to 16xQ you're running 16x supersampling with transparency anti-aliasing, that's enough to bring a GTX to it's knees.
Ramono: your problem is because the 8600 series is utter shit and performs on par with or worse than my old 6600gt.
For either of you I would suggest checking the nvidia control panel's 3d settings area and making sure you are set to "single display performance" mode. I've heard of that causing massive framerate hits before.
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