Zalman CNPS7700-AlCu Aluminum/Copper CPU Cooler (Socket 478, 775, 754, 939, 940) Does not generate noise or vibration in Silent Mode. Pure Copper and Pure Aluminum base material ensures excellent heat dissipation. Intel Pentium 4 (Socket 775), Intel Pentium 4 (Socket 478), and AMD64 (Socket 754/939/940)compatible design for broad compatibility. The large 120mm fan inside the FHS maximizes cooling performance by providing sufficient airflow even at slow rotation speeds. The large 120mm fan provides air flow over a large area, cooling not only the CPU, but the VGA card, Northbridge, FET, and RAM.