They cannot do anything at all with the heat. The temperature differential is so small, they would get nearly zero useful work out of it. Such a low temperatur

They cannot do anything at all with the heat. The temperature differential is so small, they would get nearly zero useful work out of it. Such a low temperature differential in fact that the heat dissipating passively is not enough to run the chips - they need to use active cooling. See also second law of thermodynamics.