Arctic F12 Pro Pwm 120mm Case Fan Long Service Life The Fluid Dynamic Bearing comes with an oil capsule that avoids lubricant leakage. Thus this bearing is as quiet as a sleeve bearing but comes with a significantly higher service life. Perfect Case Fan Regulation with PWM The PWM function allows the motherboard to run the fan precisely at its necessary speed. This guarantees the required cooling & minimizes the noise level. Patented PWM Sharing Technology (PST) Lowers Noise If you want to improve the cooling efficiency of your computer you get several case fans working in parallel (since it takes 10 fans to double the noise level). But what does it help if they don't work together? The PST assures that all of your fans listen to one control signal. E.g. you share the CPU Cooler's PWM signal & assure that your case fans stand down at low load & spin up whenever necessary. Innovative Design Enables Quiet & Efficient Ventilation The innovative design of the fan blades improves the air flow & facilitates a highly efficient ventilation. The impeller was designed with a focus on minimzing the noise level yet delivering the desired airflow & pressure. Patented Anti-Vibration-System A unique anti-vibration system in combination with the patented fan holder ensure a near-silent operation. Electrical Requirements Typical Voltage: 12V DC Start-up Voltage: 8.5V DC (@ 100% PWM) Cable Length: 400mm Sub PST Cable Length: 50mm Voltage Current 20% PWM 100% PWM 12V DC (Norminal) 0.02 0.22 7V DC 0.01 0.13 5V DC 0.01 0.09 Connection Motherboard: +12V DC PWM control signal 4-pin socket