The EMB series mod will do absolutely nothing for frame rates under Windows XP.
It works best under Vista or Windows 7, providing alternative post-processing, under DX9 with either first or second TW titles. DX10, aka "advanced shaders" eliminates the need for this in SF2 with the latest patches. Of course, DX10 is only available with Vista or Win7.
Now, back to the matters at hand. I have the same basic card, albeit an EVGA "superclocked" version.
I find that my best performance under SF2 is arrived at with the following settings
Driver Version 190.38
1680 x 1050 res (native to my monitor)
4X MS AA
Gamma correction
8X Aniso
V-Sync on
High Quality Texture Filtering
Triliniear Optimization
Aniso Sample Optimization
Negative LOD bias
Prerender Limit set to 3
Force Mip Maps set to trilinear
HDR enabled
These settings will guarantee FPS between 44 and 60 with a decent CPU. FPS will be limited to your refresh rate, but as they say, "DILLIGAFF!" (you figure that last one out )
One more thing, there's nothing USEFUL to be gained by having your horizon distance (in-game, under options, graphics, customize) set to anything more than NORMAL. Setting beyond "normal", forces your system to use significantly more resources to render terrain tiles at a distance at which YOU CANNOT SEE THEM ANYWAY
This has been an unofficial public disservice message from the staff here at CA