A truly impressive airflow at low speeds and exceptionally low noise emissions leave the competition far behind. The COUGAR CF-V12HP Vortex PWM fan features diversion groove turbine blades and turbine frame to deliver superb airflow. Enjoy silent gaming or computing thanks to anti-vibration pad design, aero-dynamical design, Hydro-dynamic-bearing (HDB) technology and rubber fixed pins. HDB also make the CF-V12HP durable when delivering the best cooling efficiency and super silent performance. Flexible PWM design allows the mainboard to control the fan RPM from 800-1500rpm.