The Ultra Quiet AK-CCE-7101CP uses a high engineering omni directional heat sink providing efficient CPU & motherboard zone cooling. The fan uses Intel approved power management (PWM) where speed is regulated automatically by CPU usage. Under normal conditions the CPU fan speed is low ensuring low noise computing. Intel approved pushpins ensure easy installation reliable retention & maximum compatibility on both LGA775 & LGA1156 platforms without any mounting adjustment pushpins will automatically slide into correct position. AK-CCE-7101CP is designed to work with CPUs up to 95 W. but greater cooling efficiency can be attained with efficient case airflow. Pre-applied high performance thermal compound ensures clean & easy installation. Specification: Type: Heat sink & Fan Interface: 4 Pin with PWM Control Socket (s): Intel LGA775 LGA1156. Warranty: 1 Year.