Cooler Master S1N-83CCS-06-GP 775 1.5U Cooler for Intel LGA775 Core 2 Quad, Duo, Xeon Application System: 1.5U Form Factor Active SolutionCPU Type: Intel P4 ( Prescoot, Cedar Mill )/ Pentium D ( Smithfield, Presler )Supported CPU Frequency 2.8~ 3.8 GHz up for Pentium 4; FSB 800 MHz up2.8~ 3.4 GHz up for Pentium D; FSB 800 MHz upSocket Type: LGA 775Heat Sink: Copper Base + Copper Stacked FinCooler Dimension: 97x97x29.5 MMFastener: Screw + SpringInterface Material: Shin Etsu 7783Fan Dimension: 80x80x15 MMFan Speed: 4,000 rpmFan Airflow: 42.7 CFMFan Bearing Type: Dual Ball BearingVoltage Rating: 12 VNoise Level: 42.5 dBAConnector: 3 Pins (Speed detection)Back Plate: EBP-N775 (Optional – Not included)Thermal Resistance: 0.45 °C/W for Pentium 4 / 0.33 °C/W for Pentium D