SILENT. WINGS 3. 140MM PWM HIGH-SPEED. No Compromise Silence & Performance. be quiet! Silent Wings. ®. 3 140mm PWM high-speed stands for state-of-the-art technology & virtually inaudible operation. The extremely high air pressure produced makes it a perfect choice for powerful water- & air-cooled systems. Great performance-to-noise ratio with 28.1d B (A) at 1600rpm. 6-pole fan motor for less power consumption & 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 & quality control. Three years manufacturers warranty