Zalman ZM-NB32K Northbridge heatsink, does not require a fan or power thus does not generate noise or vibration. ZM-NB32K is compatible with all Northbridge chipsets that do not have a built-in graphics core. Northbridge chipsets with built-in graphics core are compatible ONLY IF the Northbridge chipset is located between the CPU socket and AGP/PCI-E slot; and must use a recommended CPU cooler, which include CNPS6000 (Socket 462), CNPS7000B (Socket 462/478/754/939/940) and CNPS7700 (Socket 775/478/754/939/940). ZM-NB32K cannot be used on motherboards that lack mounting holes around the Northbridge chipset.