I read all the thread. It's about GPU Power Management, that, of course, depends from the video hardware.
I think, trying with and without SSDT, I can limit the maximum CPU applying SSDT.
In my case, I work with large video files for hours, and I left the machine maybe one day rendering a file and it's not a good all the time working at 100%.
In my country right now we have 32-36 degrees celcius ambient, and my processor, even with a big cooler, work around 65-75 degrees.
Maybe you don't need let the machine for hours working and of course, could be around 45-50 degrees celsius.
Something that I don't understood from you is if you have over clocked your cpu from the bios or software in the OS System...