Had to look up those two terms, from Wikipedia: Dennard scaling, also known as MOSFET scaling, is a scaling law based on a 1974 paper co-authored by Robert H.

Had to look up those two terms, from Wikipedia: Dennard scaling, also known as MOSFET scaling, is a scaling law based on a 1974 paper co-authored by Robert H. Dennard, after whom it is named.[1] Originally formulated for MOSFETs, it states, roughly, that as transistors get smaller, their power density stays constant, so that the power use stays in proportion with area; both voltage and current scale (downward) with length. Landauer's principle is a physical principle pertaining to the lower theoretical limit of energy consumption of computation. ... At 20 °C ..., the Landauer limit represents an energy of approximately 0.0175 eV, or 2.805 zJ. Theoretically, room‑temperature computer memory operating at the Landauer limit could be changed at a rate of one billion bits per second with energy being converted to heat in the memory media at the rate of only 2.805 trillionths of a watt (that is, at a rate of only 2.805 pJ/s). Modern computers use millions of times as much energy per second. [But there's a limit to how far we can improve that leading to hitting it around 2050].