SILENT. WINGS 3 . 140MM PWM HIGH-SPEED . No Compromise Silence and Performance . be quiet! SilentWings. ®. 3 140mm PWM high-speed stands for state-of-the-art technology and virtually inaudible operation. The extremely high air pressure produced makes it a perfect choice for powerful water- and air-cooled systems. Great performance-to-noise ratio with 28.1dB(A) at 1600rpm . 6-pole fan motor for less power consumption and vibration . Fluid-dynamic bearing enables super-long life span of 300000 hours . Fan frame with funnel-shaped air inlets for extremely high air pressure . Seven fan blades provide optimized airflow . PWM controlled fan speed by the motherboard . German product conception design and quality control . Three years manufacturer's warranty