The 3.5 inch fan socket comes with a radial heatsink with a 92mm fan to dissipate heat very efficiently and backplate installation to ensure system safety.Aluminum heat sink, 3.5-inch fan, 4-pin fan connector. 12VDC, 0.60A, Supports Core 2 Duo Socket 775 CPUs up to 3.0 GHz. Radial heatsink with 92mm fan to dissipate heat very efficiently. Screw and back plate installation to ensure system safety.