Two models available - NB47J and NBF47 Reduces motherboard noise to zero - operates in absolute silence Compatible with all motherboards with push-pin holes and hooks (ZM-NBF47 only) around the Northbridge chip A fan is not required, so no vibrations are transmitted into the PCB, enhancing long-term reliability Reduces power loading through the motherboard and computer PSU Reduces dust build up for more pleasant servicing and again enhancing reliability Easy to install, but does require motherboard removal Solid anodised-aluminium top quality construction