I've found that when I have the map open my gpu goes from 50 to 100% load and that really heats it up and runs the fan loud. I remember star craft 2 came out and had an issue where the menu would run gpu's at full speed causing some to burn out. I literally limit myself to 10 seconds at a time on the map screen.
The mods will close threads for getting bumped here, just a fair warning. Not sure about your issue as I can't get beyond 15 fps with my Crossfire setup as it is.