Noctua revealed their prototype passive cooler at Computex 2019 it weighed in at 1.5 kg and could dissipate 120 W passively or 180 W with quiet case fans. The prototype included mounting for both AM4 and LGA 115x sockets with the cooler able to keep an Intel i9-9900K cool under load. Noctua has been working towards releasing a commercial passive cooler in Q1 2021. This new cooler has recently been pictured by @FanlessTech and is reportedly about to enter mass production. Noctua is likely to announce more information about this new cooler in the coming months.