Modern CPUs/motherboards will automatically shut down if they go over temperature, so no worries there. As I said you're well within temp specs so go ahead and render, and keep an eye on temps and as long as they don't go above say 80 with prolonged rendering, it's fine. The limit is somewhere around 95c I think.
As for the scene, I definitely like the addition of the rocks, but they seem to almost glow and are rather blue. But compositionally they're a nice addition and the actual surfacing looks like a very good start. I do think even more haze could be good, it helps establish scale and distance, really giving us a grander feeling for those mountains. I also notice you (probably) changed the pixel filter, or just do no post processing sharpening, which I think is good in general, but it honestly is a little *too* soft now. If you're using a soft pixel filter, try Mitchell Netravali or Narrow Cubic, but don't do any post sharpening.
I think this is very close to a very good "final". Nice work!
- Oshyan