Type: Fan & Heatsinks RPM: At Duty Cycle 20%: 1600 rpm At Duty Cycle 50%: 4000 rpm At Duty Cycle 100%: 8000 rpm Air Flow: At Duty Cycle 20%: 8.75 cfm At Duty Cycle 50%: 21.88 cfm At Duty Cycle 100%: 43.75 cfm Noise Level: At Duty Cycle 20%: 16.85 dBA At Duty Cycle 50%: 35.94 dBA At Duty Cycle 100%: 51.0 dBA Heatsink Material: Copper Base & Aluminum Fins with Heatpipes embedded Compatibility: Intel Xeon 5500 Series Nehalem EP Processor Socket LGA 1366 processor W5580, X5570, X5560, X5550, E5540, E5530, E5520, E5506, E5504, E5502, L5520, L5506 for 2U Server & Up Fan Dimensions: 60 x 60 x 25 mm Weight: 490g