Intel Socket 775 Copper Core Heat Sink with Fan General Features: For Socket 775 CPU Aluminum Heat Sink Copper core Supports up to Intel Core 2 Duo E6550 (2.33 GHz) 3.5-inch fan attache 4-pin connector DC12V 0.60A Regulatory Approvals: UL CE Supports up to Intel Core 2 Duo E6700 (2.66 GHz)