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Legendary silence, epic performance and featuresFor the highest performance, optimized fan blades, especially for heat sinks designed radiator corners and a speed switch with 3 selectable speed options, Silent Wings Pro 4 140mm PWM is the most progressive, performant, and versatile fan by be quiet!Optimized fan blades for the highest performance on radiators and heat sinksSpeed switch allows changing maximum PWM speed between medium-speed, high-speed and ultra-high-speed (up to 2400 rpm)Small tip clearance and a fan frame with a funnel-shaped air outlet for extremely high air pressureVirtually inaudible operation at regular speed6-pole fan motor for less vibration and power consumptionFluid-dynamic bearing enables very smooth operationIndividual and easy mounting systems for use as a case fan or with a radiatorSuper-long life-span of up to 300,000hValuable sleeved PWM cable and easy to install PWM connectorElegant look with high-grade fan sticker in an all-black design