nvidia-settings . . . . I know youv'e probably looked here but if not . . .

Nvidia Chipset Problem Solved
 

Sorry for the delay to finish up on this. It took me swapping the original motherboard for a replacement from the manufacturer along with swapping the processor with a replacement from AMD until I finally found the problem.

I had a bad RAM module.

Apparently the motherboard meltdown took the RAM with it. However, none of the motherboards I tried reported the RAM as bad in POST.

I was trying to boot Knoppix and I noticed it had a DOS-based RAM test and so I went ahead and tried that.

All in all, it took me from November to February to finally get this solved.

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If you want to get SLI running, instead of manually editing the xorg.conf you should copy/paste this command.
That will add the line to your xorg.conf for Alternating Frame Rendering and you're less likely to make a mistake. Both "Yes" and "AFR" have worked for me but I would rather specify AFR because I have no idea what "YES" means to Nvidia. Alternately you can use SFR (Split Frame Rendering) or AA (Hellifino)