Deepcool THETA 31 PWM Socket 1155/1156 Copper Base/Aluminum Heat Sink & 3.93" Fan w/4-Pin Connector for Intel up to 95W Deepcool THETA 31 PWM Heat Sink and Fan General Features: Copper base Radial aluminum heat sink 3.93-inch (100 x 100 x 25 mm) Hydro Bearing fan with PWM function (Pulse Width Modulation) Screw and back plate installation Specifications: Fan Speed: 900 150 ~ 2400 10% RPM Maximum Air Flow: 42.76 CFM Rated Voltage: 12 VDC Started Voltage: 7 VDC Operating Voltage: 10.8 ~ 13.2 VDC