Please confirm your computer motherboard can support PWM, if not, the fan would run at full speed. it's not LED fan. Designed for advanced users GELID Silent PWM fans provide additional airflow by using Pulse Width Modulation (PWM) to automatically adjust fan speed according to the CPU load. The fan can be idled down and thus be much quieter. An intelligent IC had been integrated into the fan's PCB to exploit your mainboard's BIOS software. This technology is more efficient and convenient than using an external fan controller to adjust the voltage. Dimension 80x80x15mm Voltage 12V Rated Current 0.32A Fan speed (RPM) 600 - 3400±10%RPM Air Flow 21.17-30.97CFM Noise Level 15 - 26DB±10% Bearing Type Ball Bearing Connector 4pin Pulse Width Modulation (PWM) Color Blue Net Weight 49g Package Includes: * 1x 80x80x15mm PWM fan
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