I have suggested this before and will suggest it again.
Go to
http://www.omegacorner.com and check out his drivers. He supplys drivers for both nVidia and ATI.
I have been using his drivers since I got my card and have NEVER had a problem with them, but rather some of the best video rendering I have ever seen. These drivers have helped greatly increase the level of detail that I see without loss to FPS. As a matter of fact the framerates are higher using these drivers.
I have an el-cheapo ATI 9500 Sapphier ($140 at the time I bought it). With the omega drivers, I am able to soft-mod this card to a 9700 and I don't believe that ATI's newest card could do a better job of redering than what I have now.
I have a 100Mhz monitor with VSYNC "always on" AA at 8X and AF at 16X, and I get solid 100-->50 FPS, and the detail is incredible. No more jaggy edges on planes ... I can easily tell when they dump flaps thats how good the detail is.
The omega drivers also supply a neat little tool called "Driver Cleaner - Omega Edition" or you can get it here ...
http://www.driverheaven.net/cleaner/This tool is recommeded to be used when switching for the first time, from ATI drivers to the Omega Drivers but can also be used when updating from one ATI version to the next.
Blammo, from looking at your specs, you should definately be getting much better FPS than your getting. Driver Cleaner may help you. Part of the problem is that when updating video drivers, it seems that old driver files are left behind and can cause problems with the newer drivers ... kinda like short-circuting them.
The guy that writes these drivers is part of the ATI Beta Team, so he knows what he is doing and is privy to stuff that we don't know about.
For more on the omega drivers, go to DriverHeaven ...
http://www.driverheaven.net/forum.php?and check it out.
For those of you that have the right kind of ATI card and are not faint-of-heart you could also do this ...
"Temporal anti-aliasing on R3x0 investigated"This tweak can be found at ...
http://www.elitebastards.com/page.php?pageid=4533&head=1&comments=1I have applied (or turned on) this tweak and its amazing.