https://www.pcgamer.com/arctics-fanless-cpu-cooler-can-help-you-build-a-silent-pc/

Alpine has released a couple of new coolers for builders who are trying to assemble a quiet or completely silent PC. The company's new Alpine 12 Passive and Alpine 12 AM4 are both passive coolers, meaning they don't come with a cooling fan, and between the two are compatible with modern sockets.

Bear in mind that these aren't for high power processors, like the Core i7-8700K or Ryzen 7 2700X. The thermal profiles of those and other similar chips are just too high. According to Alpine, its new passive coolers are powerful enough to cool compatible CPUs up to 47 watts. Intel's Core T series comes to mind, and AMD is rumored to be releasing a couple of 45W second generation Ryzen processors (Ryzen 5 2500E and Ryzen 7 2700E).