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. I am also no longer able to read the GPU VDDC using Speedfan. Any ideas on how to fix this. The errors started when upgrading to Win 8.1 but were not solved by reverting.
Thanks for your suggestions.