It's not just power consumption - fire safety can be a factor. Although spontaneous combustion of a computer by itself is vanishingly unlikely, it only takes so

It's not just power consumption - fire safety can be a factor. Although spontaneous combustion of a computer by itself is vanishingly unlikely, it only takes some loose piece of fabric or paper to waft its way across the fan and you have a genuine combustion risk. That is better-protected against now that most chips have built-in thermal cutoff measures, but a lot of machines still get warmer than I would like them to be.