der8auer's 110cm Chimney Cuts Ryzen 7 9800X3D Heat by 19°C Without Radiator Fans
Updated
Updated · VideoCardz.com · Aug 1
der8auer's 110cm Chimney Cuts Ryzen 7 9800X3D Heat by 19°C Without Radiator Fans
3 articles · Updated · VideoCardz.com · Aug 1
Summary
A 110 cm 3D-printed chimney lowered a Ryzen 7 9800X3D from 90°C to 71°C while keeping the water-cooling pump running and removing only the radiator fans.
The setup worked through natural convection: warm air rose through the vertical duct, pulling cooler air across the radiator fins via the stack effect.
Shorter versions barely helped at first—10 cm cut about 0.5°C—but a 30 cm chimney reduced coolant by another 5°C, and the full 110 cm design pushed coolant from about 61°C to roughly 50°C.
Fog tests showed little airflow without the chimney, then visible suction through the radiator once the full-height duct was installed.
The experiment suggests chimney height alone can cool a high-end CPU radiator, though der8auer said the 110 cm design is too bulky and less efficient than standard fans for real PCs.