Top Motor DF127720BM 77mm x 20mm Single Flange 2 Ball Bearing 4 Pin CPU Fan NEW! Great Quality Fan for 77mm Low Profile PWM CPU fan replacement! Voltage: 12 volt 0.50A Noise: 13dBA -45.8 dBA Speed: 1000-4500 rpm Airflow: 10-45 CFM Bearings: 2 Ball Connector: 4 Pin PWM (8" leads) Dimensions: 77mm x 77mm x 20mm Single Flange Fan