The low noise AK-959 uses a high engineered multi directional heatsink with copper core and bi-ped fins providing cost effective efficient CPU and motherboard cooling. The PWM fan is regulated automatically by CPU usage so under normal PC work load the fan speed is low ensuring quiet computing but extra performance is available when needed.Intel approved pushpins ensure easy installation, reliable retention and maximum compatibility on both LGA775 and LGA1156 platforms without any mounting adjustment, pushpins will automatically slide into correct position.AK-959CU is designed to work with CPU's up to 115 W but greater cooling efficiency can be attained with efficient case airflow. Pre-applied high performance thermal compound ensures clean and easy installation.