Dynatron N11 Cooling Fan/Heatsink - 2.36in Maximum Fan Diameter - 1 x Fan(s) - 368.9 gal/min Maximum Airflow - 8500 rpm - Dual Ball Bearing - Pin#1-Black(-), Pin#2- Yellow(+), Pin#3- Green(Tachometer/ Signal Output), Pin#4- Blue (PWM)

Aluminum fin stack with heat pipe embedded, active cooler for 2U server and up, support 270 watts CPU power heat dissipation. Features dual ball bearing for higher heat endurance and reduced noise emissions Helps the compatible servers by maintaining a great balance of performance and efficiency The flawless rotation of up to 8500 rpm is just what you need for prolonged cooling