Noctua teases pumpless CPU water cooling as 'the future of PC cooling' coming to Computex
Computex 2025Noctua has previously shown off prototypes of a thermosiphon AIO CPU cooler, hinting that the cooler will be headed for production at some point, but now it seems as though the company is ready for the cooler prototype to be shown off to a wider audience at Computex in Taipei, Taiwan.
According to a recent post by Noctua on X, the thermosiphon cooler, or at least a version of it, will be shown off at Computex 2025. The teaser was accompanied by a brief look at the hardware, which showed off large cooling channels milled into the CPU block. The cooling channels are milled in a V shape, indicating that the orientation of the CPU block, and potentially the rest of the cooling system, will be important to ensure proper cooling and circulation.
The thermosiphon previously made an appearance at Computex 2024, although it looks to have undergone significant design changes since then, judging by the images featured in this PC Gamer article. From the looks of it, the new version Noctua teased in the X post has a redesigned CPU block, with the aforementioned V-shaped channels and potentially a larger capacity for coolant in the CPU block itself. PC Gamer also mentions that it appears as though the thermosiphon will enter production in 2026.
Thermosiphon explained
A thermosiphon is a passive cooling system that uses the heat generated by the CPU itself to move the liquid around the loop, as explained by Arrow Electronics. The basic functionality is similar to that of a heat pipe or vapour chamber: The coolant boils and travels to the highest point in the cooling loop, where it settles on a condenser, cools, and re-enters circulation. The idea is that, by using a liquid with a boiling point lower than the target CPU temperature, you can circulate the coolant without the need for a pump.
For Noctua, the idea of a thermosiphon seems to make a lot of sense, since a lot of the company's marketing and products revolve around achieving maximum cooling and performance without creating a lot of noise in the process. This seems to be the goal with the thermosiphon, too, since the company mentioned in a reply to a comment on the post that "If it’s loud, Noctua probably wouldn’t be working on it."
The radiator end of the thermosiphon will almost certainly still feature fans, but Noctua is known for its near-silent fans, like theNoctua NF-A12x25 (curr. $34.95 on Amazon).
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