Przegrzewanie procesora

Try these commands

sudo -i 
echo low >  /sys/class/drm/card0/device/power_profile
exit

wait few seconds and check again the temperature.
Above command will pass the low profile so the temperature will fall down as the fan as well.
If you want to use this in an installed system you can pass the command in every boot through rc.local

sudo sed '/^[^#]*exit 0/i echo low >  /sys/class/drm/card0/device/power_profile' -i /etc/rc.local