be quiet! Silent Wings Pro 4 140mm PWM High Speed - Fan

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 sinks- Speed 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 pressure- Virtually inaudible operation at regular speed- 6-pole fan motor for less vibration and power consumption- Fluid-dynamic bearing enables very smooth operation - Individual and easy mounting systems for use as a case fan or with a radiator- Super-long life-span of up to 300,000h- Valuable sleeved PWM cable and easy to install PWM connector - Elegant look with high-grade fan sticker in an all-black d