WTF?! We've seen PC builds that prioritize performance, ones that focus on silence, and those that look like they belong in a cyberpunk art gallery. Billet Labs' latest project falls firmly into the latter – as usual. It's a custom passive water-cooled gaming PC with no fans, lots of copper, and enough heat to make its creator admit the internet might have had a point.
The build comes from Felix at Billet Labs, who set out to answer the question: can you cool more than 500W worth of modern PC hardware without any fans? The internet's usual answer to passive water cooling is that it is pointless and inefficient, but that wasn't going to stop someone who previously turned a century-old cast-iron radiator into a PC cooler.
This new system uses many of the same core parts as that earlier "Raddy" project, including a Ryzen 7 9800X3D, an RTX 5080, a Gigabyte Aorus Pro B850 motherboard, 32GB of RAM, 2TB of storage, and a 600W Flex ATX PSU. Raddy looked amazing, but it weighed around 100kg (220 pounds), needed regular flushing, and was not truly passive as it still had three fans.
For the new machine, Felix used three radiators: a 120 x 240mm unit, a 140 x 280mm radiator, and a much larger 200 x 400mm model. They were stacked above the components in a tapered tower designed to use the convection chimney effect. Hot air rises through the large lower radiator and continues upward through the smaller ones, theoretically pulling more air through the system without mechanical assistance.
