this post was submitted on 24 Mar 2025
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Noctua's pumpless 'thermosiphon' liquid cooling unit is expected to be released in 2026 and has already given me a free lesson in basic thermodynamics (www.pcgamer.com)
submitted 1 week ago by [email protected] to c/pcgaming
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Interesting to see a major brand trying to do this. I wonder Icegiant will respond.

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[–] monotremata 9 points 1 week ago* (last edited 1 week ago)

That's not how the article describes it, at least:

Essentially it creates a vapour chamber-like effect by using heat emitted from the CPU to evaporate a refrigerant, which then moves up a vapour tube into a fan-cooled condenser, where it cools off, condenses back to a liquid state, and makes its way back to the CPU to be heated again—no pump required.

Which sounds exactly like a heat pipe.

Edit: I guess the difference is that heat pipes use wicks and capillary action to return the liquid phase, where the thermosiphon instead uses gravity, which makes it a little easier to produce and higher capacity, but vulnerable to changes in orientation.