The Star Tech.com Slot 1 Pentium II/III CPU cooling fan is a combination of heatsink & fan designed for cooling Intel Pentium II & III CPUs that use the SECC2 cartridge. A quiet running 5cm brushless ball bearing DC motor coupled with a high-efficiency blade design is capable of moving 9 CFM (cubic feet per minute) of air. Power is supplied to the fan using a 3-lead TX3 connector that plugs into the motherboard & allows the system to monitor fan speed & operating status.