E7400 slightly overclocked to 3.0GHZ.
4GB DDR3 Ram
HD5830 ATI Video Card
1920X1200 Monitor (Resolution is important to note as well)
I can turn EVERYTHING but shadows on max (2048 textures + hi res, sliders on DETAIL and MAX DISTANCE, MAX AA, Detailed water/ground, bump map). I can turn on buildings' shadows. I can turn on Self Shadows 2048 textures +smoothing and maintain 50+FPS in 99.9% of situations. 4096 textures yields 40-50fps for the most part and some stuttering.
Because I don't like how the self shadows look at those low of textures, I run with it off. Seems to make gameplay much smoother regardless of FR.
If I turn on other plane's shadows, my FR drops to 25-30 at times.. pretty much no matter what my other graphics settings are.
When I bought the 5830 (to replace my nvidia 9800GTX+) it performed better than I had expected, but not as good as I had hoped. Looking back now I wish I had saved up for at least a 5850 but I still can't complain. The 5830 has been good so far.