This is related to the physics of computation: ultimate physical computers coincides with temperatures approaching need to 0 K - (reversible computing, Landauer Principle) . Heat/entropy is computational stupidity.

Incidentally, this also explains the fermi paradox: post singularity civilizations migrate out away from their hot stars into the cold interstellar spaces, becoming dark matter. (which however, does not imply that all cold dark matter is intelligent)