[minsc_tdp]

My system similar, except one 8800 GTS card but you have SLI. Even so, 4 fps is way too slow for that setup.

Try disabling SLI.
Try getting the latest BETA drivers for Nvidia (the ones that fix the Lost Planet problems.)
I've had so many major driver issues with the Nvidia stuff that I've resorted to using Driver Cleaner Pro in Safe Mode to strip out the drivers before installing any new ones, always.