Hello, After upgrading to windows 8.1 (and reverting back to 8.0).The fan speed of my HD7650A is no longer being regulated. When ever it is active (it is a switchable graphics card) the fanspeed goes up to 6000rpm (which is the max speed). It used to be regulated and always hovered around 3000-4000. Any ideas on how to fix this. The errors started when upgrading to Win 8.1 but were not solved by reverting. Using Speedfan I can not lower the fan speed. Do you think this is software or hardware related? Thanks for your suggestions.