Cooler Master Socket 775 Aluminum Heat Sink & Fan w/4-Pin Connector - CPU Cooler Cooler Master Socket 775 Copper Core/Aluminum Heat Sink and Fan General Features: Copper core Aluminum heat sink 3.14-inch 12V fan Supports Socket 775 processors up to 3.4 GHz 4-pin power connector (12-inch cable length, approximate) Regulatory Approvals: CE UL