Zalman Computer Noise Prevention System with Silent Fan and Copper Heatsink CPU Cooler CNPS7700-CU Pure Copper base material ensures excellent heat dissipation. The large 120mm fan inside the FHS maximizes cooling performance by providing sufficient airflow even at slow rotation speeds. Compatible with all single and dual core CPUs for Intel Socket 1155/1156/775 and AMD Sockets 754/939/940.