March 29, 2026
Heatless hype meets hot takes
The Failure of the Thermodynamics of Computation(2010)
Philosopher pokes holes in ‘free’ computing; comments split between dreamers and eye‑rollers
TLDR: Norton says the “only erasing costs energy” rule relies on unrealistic, jitter‑free assumptions, challenging a cornerstone of low‑power computing hype. Commenters split between idealists who see useful guidance, skeptics who applaud the debunk, and jokers riffing on infinite Turing tape—raising real questions about what “efficient” can mean in practice.
John D. Norton just rained on the “energy‑free computing” parade, arguing that the famous rule that only erasing data must waste heat is built on shaky, idealized assumptions. In plain terms: real, tiny machines jiggle, and that jiggle breaks the fantasy of perfectly reversible, zero‑heat steps. He even offers a bite‑size no‑go summary for the brave.
But the real fireworks are in the comments. One camp shrugs and says, so what? User svantana calls reversible computing a “platonic ideal” that still helps cut waste, pointing to nascent [reversible chips] as proof the dream inspires progress. Another camp cheers Norton’s takedown—oh_my_goodness calls it a “very clear intro” to a slippery topic—while ogogmad goes full philosophy, asking where the “probabilities” in physics really come from (cue brain melt).
And then came the meme: debatem1’s zinger about nobody building a Turing machine with enough tape turned the thread into a comedy club. Team Dreamer insists ideals guide engineering; Team Realist fires back that hype about “free” computing needs a cold shower. In between, curious lurkers wonder whether this kills the hope of super‑efficient chips or just resets expectations. Verdict? The theory is on trial, the vibes are chaotic, and the hot takes are hotter than a CPU under load.
Key Points
- •The thermodynamics of computation assumes most molecular-scale computational processes can be non-dissipative, with erasure as the sole necessarily dissipative process.
- •Norton argues Landauer’s Principle lacks sound justification and relies on flawed applications of statistical and thermal physics.
- •Thermal fluctuations, such as Brownian motion, inherently affect molecular-scale processes and undermine assumed thermodynamic reversibility.
- •The theory selectively accounts for fluctuations during erasure but ignores them for other processes, creating inconsistency.
- •Norton presents a no-go result showing the foundational tenet arises from improperly and inconsistently implemented idealizations.