Nvidia SLI questions

Hello, I was wondering what peoples experience has been with SLI in Second Life. NVIDIA does not officially have a profile for Second Life so it makes it a little harder to know what works well and what does not. I have been exterminating but it does not seem to matter what SLI mode I use the driver tends to crash 20-30 minutes. If any one has any suggestions please let me know. Here is what I have done so far.

Full Screen mode
Resolution of 1680X1050
Anisotropic Filtering (override application) 16x
Antialiasing mode (override application) 8xQ
SLI Performance mode Force Alternate Frame Rendering 2

In a low population area I get about 48-55 FPS.
In a high population area I get 27-34 FPS
I have tried both of the rendering modes and it seems that AFR2 is the most stable. But it just crashes. Granted if I run the system in single GPU mode it’s incredibly stable but my frame rate drops by 10-13 FPS. I am just hoping to find a way to run Second life nice and smooth, and if I can use both my video cards that would be a huge plus. Thank you in advance for any information any of you may have.

I'm getting about 48 -51 basic fps just standing around on help island. There are a few people around not many. Probably low population. Don't like fullscreen mode it seems to not scale properly so am using windowed mode.

8800GTX sli default settings (probably single gpu)
680i A1 MB
4GB ddr 1066Mhz
XP home sp3
1920x1200
wolfdale E8400 @ 4GHz

I hope this has succeeded in removing the bugs.

What model video cards do you have?
What operating system?