https://bugs.freedesktop.org/show_bug.cgi?id=87796
--- Comment #30 from Clésio Luiz magolobel@yahoo.com.br --- After reading the Andreas Gihr post about greater power consumption, I did a little test. Using Kubuntu KDE 4 I put the display at 60Hz and watched the GPU temperature drop 3°C. Put it back at 120Hz and the temp go up the same 3°C.
But to me, this is expected. The GPU is working more to double the FPS of the KDE compositing. So is natural it getting hotter.