Application System 2U+ Form Factor Active Side-flow Solution CPU TypeIntel® Nehalem Socket Type LGA 1366 Heat Sink Copper base + Copper stacked fin + heat pipe x 4 Cooler Dimension 91.5 x 89 x 64.5 mm Fastener Screw + Spring Interface Material Shin Etsu X23-7783 Fan Dimension 60 x 60 x 25 mm Fan Speed 7,300 rpm Fan Airflow 50 CFM Fan Bearing Type Dual Ball Bearing Voltage Rating 12 V Noise Level 16.16 ~ 47.2 dBA Connector 4 Pins with PWM function Thermal Resistance For Nehalem-EP: 0.20 °C/W Back Plate EP-N1366-01-GP (Optional)