Why does server hardware need such tiny fans?
Noctua's small 40mm fans may look like toys, but in practice, they often save expensive server hardware from overheating. High-end network cards, RAID controllers, and other components are designed for powerful airflow inside server racks, but in standard tower cases, they literally choke.
That's why enthusiasts install these fans in workstations, mini-ITX builds, 3D printers, and even audio systems. Despite their size, they generate powerful airflow and help cool hardware that standard case fans simply can't reach.