Arctic Freezer 64 Pro PWM Socket AM3/AM2+/AM2/939/754 Copper Core/Aluminum Fin Heat Sink & Fan up to Phenom II X4 955 General Features: Copper base with 6 copper heatpipes (3 double-sided) 42-fin aluminum heat sink design 92 mm fan (3.6-inches) fan Extremely quiet Patented fan casing Fan speed control over PWM signal Integrated cooling of voltage converters Patented vibration absorption Easy installation Pre-applied with MX-1/MX-2 thermal grease compound 11-inch 4-pin power connector