Magnetic Levitation FDB: New magnetic levitation hydraulic bearing,maximize the airflow (around 106cfm) but minimize the noise(around 40dBA),very excellent sound quality. Fan Specification:Size: 120x120x25mm 4.72x4.72x0.98inch Speed: 600-3000 RPM±10% Airflow: 70.5-106CFM Noise: Max 43dBA Current: 0.22-0.36A±10% Volt: 12V DC Interface: 4Pin PWM Air Pressure: 3.5-5.0mm H2O. High Speed 3000 RPM: High speed 30000rpm 106cfm and good balance and low noise, designed for those who need very strong airflow cooling fan. Good Dynamic Balance: The 120mm fan is dynamically balanced, even at full speed 3000rpm ,it will keep balance. 4-Pin PWM Interface: With 4pin PWM ,motherboard will adjust the fan speed from 600RPM-3000RPM according to inner working temperature automatically.