The thermal paste on the CPU has dried out and needs to be replaced. I'm back to my old computer until I can sort that out. Didn't help that my CPU fan was plugged into the wrong socket.
Done using some stuff I borrowed from work. The temperature is now around 40C - hotter than before but still acceptable.
Done using some stuff I borrowed from work. The temperature is now around 40C - hotter than before but still acceptable.