Slick Rick, you need to go here :
http://downloads.guru3d.com/download.php?det=163 and get Riva Tuner 2.0 RC16 its a great little app that reads both Nvidia and ATI graphics card setting, of which then you can then twiddle to your hearts content......FSAA/Aniso/Refresh/Sync...it goes on and on......I just ALT-Tab in and out of the game after setting something up to see if it had a positive or negative effect on my FPS which you can always have on the SH3 screen by Ctrl-F8.
You can then find whats right for your particular card, also while at Guru of 3D look at there modified Warcat drivers..... there tweaked to give you that little bit extra.
. I'm no ATI expert so you would have to maybe look at a few forums to see what the "Scene" is......
Deep Six