2 x Pack Noctua NF-A4x10 5V 40mm x 10mm Low Noise PC Case Fan 4500 RPM, 17.9 dBA
The latest version of Noctua's advanced Smooth Commutation Drive system ensures superb running smoothness by eliminating torque variations and switching noises. This makes the NF-A4x10 remarkably quiet even at very close distance.