DX10 is still in test mode. Doesn't look any different than DX9 anyway.
Also your Ram could be the culprit try to run some tests download "Memtest" and run the Windows Diagnostics memory test.
You can also check your HDD for errors by downloading "HD Tune"
And the most obvious, but im sure you have checked is temperatures of the video card and your CPU
shadows rape fps iirc
Thanks ill tyr out the teeak guideBest tip i can give for smoothing out on your setup is to max all your view distance sliders and high quality distance sliders. Sounds strange but the way the game engine calls textures an LoD models has a massive hit on performance. On your hardware maxing them out should actually improve performance.
Didn't this game fail?