der8auer tests PC chimney effect, dropping CPU temps by 19°C with a 110cm 3D-printed tower
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Crystal ball: Some pieces of PC building advice have circulated so long that nobody bothers checking them anymore. One is the chimney effect: the claim that a case works like a flue, and that pointing your top fans outward gives hot air a natural boost on the way up. German overclocker der8auer decided the best way to test it was to actually build one.
Building one meant understanding what a chimney actually does, which isn't quite what the forum posts assume. Hot air rising is just convection, and it happens around anything warm. A chimney works because that rising air is trapped inside a tall channel, so as it climbs it drags cool air in behind it through the bottom. The taller the channel, the harder it pulls.
A normal case doesn't have...
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