[Andris6000]

I have very nearly the same specs and card as you- but mine has only 3/4 G RAM. The only other difference is that I am running at 1680x1050 (my monitor's native resolution). Have you considered running at a lower res?
Also, be advised that if you have an LCD monitor (as nearly everyone does nowadays) you fps will never go very much above you monitor's refresh rate, (which is usually 60) unless you turn off vsync, which usually is not a good idea. If you set the game to run at a lower resolution than native, you may get a higher refresh rate and thus higher fps.

I have an LCD and I am using the naitive resolution too. If i try to change the config to an other resolution , like your's . 1680x1050 . the game for some reason won't even load up . No error no nothing just doesn't do it .