The StarTech Slot 1/A Pentium II/AMD Athlon CPU cooling fan is a combination heatsink and fan designed for cooling Intel Pentium II CPUs that use the original SECC plastic cartridge (233-400 MHz), or AMD Athlon CPUs. It sports an extra-large heatsink with enough cooling capacity for any CPU. 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.