I have the same problem.
Ive seen someone mention it and then checked my temps and its true.
The problem is not there due to bad cooling. Definitely.
First, because a lot of people are seeing it and experiencing it and they cant all have bad cooling at the same time. Second, because i know a lot about it and ive checked and upgraded my cooling - and still have the same effects when playing longer.
I do have an oldie, HD 4850 which is known to be a very hot card. Yet when its working at its defaults it is stable at its temps of somewhere between 60 to 75 C. (about 50C in winter times)
After i saw OS getting it to 110 C, i took it out, cleaned it and the whole case thoroughly, took off the GPU cooling and applied new coating of thermal paste. I even added one more case ventilator to blow out hot air and enabled the front one to bring more extra relatively cooler air inside.
That did not help at all. For OS.
Temps, as followed by "CPUID Hardware Monitor" get to 110 or 115-117 Celsius.
I am not sure how my card is surviving this exactly, but i guess i bought a quality version.
Right now, i have the game tabbed out, my characters standing in dr. Thelyrons office, while i browse the web and write here. The temp is at about 63-65 C.
Which means the GPU heavy tasks are most probably and expectedly related to combat, with all of those special effects, characters, enemies and all that stuff going on all at once.
