Deepcool ALPHA 400 ST Socket 775 Copper Base/Aluminum Heat Sink & 3.62" Fan w/Copper Heatpipes & 3-Pin Connector Deepcool ALPHA 400 ST Heat Sink and Fan General Features: Copper base Alumimum fin heat sink 3.62-inch (92 mm) Hydro Bearing fan Four (4) Copper heatpipes provide excellent heat transfer Screw and back plate installation Specifications: Fan Speed: 2200 10% RPM Maximum Air Flow: 37.36 CFM Rated Voltage: 12 VDC Started Voltage: 7 VDC Operating Voltage: 10.8 ~ 13.2 VDC