Raijintek showed a rather impressive new liquid cooler concept at Computex 2016 which is actually the world's first passive liquid cooler as it lacks both the pump as well as comes without any fans on the radiator.
According to details, the new closed-loop liquid cooler works in the same principle as a heatpipe, with combination of convention and phase-changing to do heat transfer.
The heat from the CPU causes the coolant to change from liquid form to vapor and move to the radiator where it condenses back to liquid and flows back down to the vapor block.
The concept was showcased at Computex 2016 and it actually work flawlessly.
According to the source, Raijintek spent a lot on the R&D and has already patented it in most markets so we should see some of the first products based on this concept soon.
Source:
Techpowerup.com.