Ditto. Played over 100 hours, as much as 8hrs in a row, no problems. Only after the "big patch & DLC" do I now have a video card overheating issue. I have an ATI HD 4850. Useing the CCC I watch my temp rise to 100 C within 10 min of play, and have to shut it down, or the computer will shut itself down.
I followed one posters advice and uninstalled the driver, rebooted, ran driver sweeper, rebotted, then installed the latest ATI driver 10.12, but the issue remains the same. No other game or application I use causes my video card to rise in tempature like this. I have tried replaceing the side pannell with dual fans, but that only slows the heating rate, and it still eventually overheats (adds about 5min play time)
I am convinced that I will have to wait until a fix is patched into the game before I will be able to play it again.
Update, if I select DX9, with all the graphic settings on low, I can play for a full 30 min before hitting 100C. (just a reminder, I could play on DX10/11 with graphic settings on high without overheating before...)