Just a "heads up", I went to the Nvidia site yesterday to check on driver updates and there was a message stating the last release (196.75) caused the graphics card fan to operate improperly and recommended a new release (197.13)
Today, I went back to the site and the message was gone, but in doing a Internet search, I found this:
http://www.betanews.com/article/Nvidia-admits-GeForce-drivers-responsible-for-fan-problems-issues-updates/1268942898So, while TG2 doesn't really task the graphics card that much (as far as I know) it does cause your system temperature, especially CPU, to rise. This would cause the graphics card temperature to rise.
Also, some of you may run software like 3D-Coat, which supports GPU (CUDA) processing. This would also cause a temperature rise which the fans wouldn't react to properly (see link above.)
Many games would also tax the graphics card, so check to make sure you're now running 195.75.
