You should be able to get away with running the gpu fans at 80. I've left my fans at 70 for the past two years, and they haven't died yet. For testing purposes, try running the fans at 80 with a small fan blowing on it. It should bring down the temps a few degrees.
Thanks, I will try this tomorrow when I get the additional fan.
Also, I remembered that the cgminer.conf file has temp overheat and cutoff options. They may have something to do with your computer shutting down.
"temp-cutoff" : "90,90",
"temp-overheat" : "85,85",
"temp-target" : "75,75",
Are you suggesting I add this to the config file I listed above? ***edit*** I just re-edited my previous post - that is my bat file listed there. I am not running it with the config file. I am running it from the bat file.