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.