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Have you tried enabling dpm? When enabled with a kernel parameter it dynamically changes the card frequency. I think you need a kernel version > 3.11. Check out:

https://wiki.archlinux.org/index.php/ATI#Dynamic_power_manag...

and

http://www.x.org/wiki/RadeonFeature/#index3h2

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I didn't yet. The best results I could possibly achieve were dynpm ones - about 65 degrees Celsius, which is completely unacceptable anyway. I've moved to a regular desktop PC, and I'm so happy for it ever since. Good to know though, that some improvement seems to be made. Thanks for that link!

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