Dynatron FAN- P555 2U CPU Fan For Intel Socket775 Specification Mfr Part Number: P555CPU Application: Intel Socket 775 Core 2 Extreme Quad-Core Processor QX6700/ Core 2 Quad Processor Q6000 Sequence/ Pentium D 900 Sequence for 2U Server & PedestaHeatsink Material: Copper Base & Aluminum Fins with Heatpipes embededFan: Speed: At Duty Cycle 0%: 1000 rpmAt Duty Cycle 20%: 1000 rpmAt Duty Cycle 100%: 5500 rpmBearing: 2x BallAir Flow: At Duty Cycle 0%: 8.36 cfmAt Duty Cycle 20%: 8.36 cfmAt Duty Cycle 100%: 53.899 cfmNoise Level: At Duty Cycle 0%: 20.6 dBAAt Duty Cycle 20%: 20.6 dBAAt Duty Cycle 100%: 51.4 dBAAir Pressure: At Duty Cycle 0%: 0.009 inch-H2OAt Duty Cycle 20%: 0.009 inch-H2OAt Duty Cycle 100%: 0.220 inch-H2ORated Voltage: 12 VPower: At Duty Cycle 0%: 0.54 WAt Duty Cycle 20%: 0.54 WAt Duty Cycle 100%: 9 WLead Wire Pin Out: Pin1: Black (-)Pin2: Yellow (+)Pin3: Green (Techometer/Signal Output)Pin4: Blue (PWM)Dimension: Fan: 77 x 77 x 20 mmOverall: 94.0 x 89.1 x 64.0 mmWeight: 460 g