Hello Dwarf, welcome to the forums!
Sorry to hear of your issues. I personally have a Raedon 6900 HD graphics card, but only one and have not experienced any issues.
First, I'd uninstall the driver and then reinstall it. If that still won't help then to not only disable crossfire, but totally remove a graphics card from your computer. If that one overheats, then try just the other.
It can be possible this is a driver problem or a hardware problem. The game shouldn't be giving anyone an issue like this as over 60k players have been able to play.
Also, in the future be sure to buy a nVidia graphics card when getting an Intel processor as those companies really work together to ensure the most efficient driver is made possible. Raedon and ATI do the same thing.
Last edited by LightningLockey; 02/07/14 05:54 AM.