While [Knight’s] demonstrations showed that reversible computation was possible, the wall-plug power usage was not necessarily reduced: Although power was recovered within the circuit itself, it was subsequently lost within the external power supply.

Even this would be a boon to CPUs - you could export all your entropy to fat circuits with passive cooling. We’re trying to shove a kilowatt through a postage stamp of silicon without turning it into a light bulb. Having all that power simply pass through would leave it as cool as a power cable.

… or you could shove in ten kilowatts.