be quiet! Silent Wings 4 - 120mm

Optimized fan blades for the highest performance on heat sinks. 6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations; Virtually inaudible operation at regular speed. Small tip clearance and a fan frame with funnel-shaped air outlets for extremely high air pressure. 6-pole fan motor and fluid-dynamic bearing for less vibration and very smooth operations. 5-year manufacturer warranty