There's a thread in the "community help" section over at UBI titled "Nvidia frustrations" that should have some possible solutions to get you to a point where you can get some terrific performance from your GPU. I had a 7950GX2 for awhile (right after they came out) and had very similar issues. Page 20-22 IIRC, of that thread discusses most of the things I did to get mine setup properly and was the result of a post by a member named Daimonsyrius.
In a nutshell, there are settings in the NV control panel as well as some line values in your IL2 conf.ini folder that should get you all set.
Sorry, I can't link that forum from work or I'd point you to the exact spot.
a couple things I know for sure:
1. Force SFR (split frame rendering) (NV control panel)
2. Set "videosetupID=x" to a value of 17.
TB
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