Variable-speed fan controllers for computers usually use PWM (Pulse-width modulation), as it is far more efficient when compared to the traditional one. The PWM technology allows the 4-pin fan to be more temperature-sensitive, so that the turning-speed can be adjusted automatically over the BIOS setup if your mainboard supports this specification. Size (mm): 80 x 80 x 25 (ball bearing) Volt (DC): 12V Speed (RPM): 600~2200 Airflow (CFM): ~23 Noise (dB): 32~39 Connector(s): 4 PIN PWM MB connector incl. speedo-sensor wire, 1x Molex Scope of delivery: Fan, set of screws Flere detaljer Vis mindre