There is a workaround in the registry similar to the wrong GPU error of a previous driver version.
Official NVIDIA Forceware 196.75 display driver feedback thread - NVIDIA Forums
I didn't have temp problems when I had the 196.75 driver even when I had MSI Afterburner set the fan control to Auto. I rolled back to 196.21 though as the 196.75 doesn't have 3D vision drivers yet.