| Double ball-bearing design lasts longer than conventional fans , 3-speed switch lets you balance quiet performance with maximum cooling , 3-pin and 4-pin power connectors provide convenient connections to your motherboard or power supply , Fan-speed monitoring capability included (requires compatible motherboard) Speed RPM: , 1200 , 1600 Airflow CFM: , 21 , 28 Noise dBA: , 14.6 , 21 |