At Duty Cycle 0-20%: 1600 RPM At Duty Cycle 50%: 4000 RPM At Duty Cycle 100%: 8000 RPM At Duty Cycle 0-20%: 8.75 CFM At Duty Cycle 50%: 21.88 CFM At Duty Cycle 100%: 43.75CFM H.C.C.(Heatpipes Contact CPU) Copper Base & Aluminum Fins with Heatpipes embedded