Arctic Cooling, Ultra Quiet Case Fan F8 PWM, 80 x 80 x 38.5mm, 600-2000 RPM, Air Flow: 28.0 CFM / 47.6 m3/h, Noise Level: 9.0 dB(A) - 20.0 dB(A), 0.07 Sone - 0.3 Sone, Power Consumption: 12 V, 0.12 Amp, Fluid Dynamic Bearing, Connector / Cable Length: 3 Pin Molex / 300mm. PST: PWM amplifier integrated on motor circuit, 4 pin plug for receiving power and PWM signal from motherboard, 4 pin socket for CPU cooler or second fan, 3 pin plug to send fan RPM signal to motherboard.