DESCRIPTION Compatible CPU:All Power Interface:Socket 775 Air Volume:20CFM Model Number:S420 Heatsink Material:Copper & Aluminum Fan Speed Control:No RPM Type:Conductive Heatsink Plaster Application:Processor Bearing:Ball Bearing Package:Yes Power:0.9W Thermal Conductivity:>1.36W/m-K Thermal Impedance:<0.229℃-in2/W Specific Gravity:>2 Viscosity:1000