be quiet! Silent Wings Pro 4 120mm Fan Review

The be quiet! Silent Wings Pro 2 140mm has three modes, allowing you to select from a low speed with silent operation, to increased noise and high performance. In case you cannot decide on the speed more, you can leave it at the UHS mode, and adjust fun speed through a PWM signal easily, through software. 

After reviewing the larger model, it was time to check the 120mm version of the Silent Wings Pro 2 line. It also has a three-mode switch, which I don’t find such an exciting feature, especially since the first time I took noise measurements in these fans, I didn’t notice it, so I only checked at the lowest mode, so I had to rerun noise measurements, the next day, to complete testing. All modern mainboards allow for precise PWM control, and many users also use PWM hubs, like the Corsair Commander Pro, to adjust fan speed profiles according to their liking. Mode selection through an inconvenient switch at the fan’s center looks like an “old school” method. If you still want to do it, follow Super Flower’s way with a remote control.

The Silent Wings Pro 4 140mm is a high-end fan with a 6-pole fan motor and a fluid dynamic bearing for lower noise output and increased reliability, as depicted by the 5-year warranty. The speed switch I mentioned above allows you to select between medium-speed, high-speed, and ultra-high-speed (up to 3000 RPM). The manufacturer claims high static pressure thanks to the decreased distance between the fan blades and the frame, which prevents air leaks.

be quiet! provides three different mounting options for radiator, chassis, and general usage.

Cybenetics Fans Database


Official Technical Specifications:
  • Model Name: Silent Wings Pro 4 120mm PWM
  • Nominal Input Voltage: 7 – 13.2 VDC
  • Rated Voltage: 12 VDC
  • Modes: M/HS/UHS
  • PWM Control: Yes
  • Rated Input Current: 0.30A
  • Max Power: 3.6W
  • Rotational Speed (Max): 3000
  • Acoustical Noise (Max): 36.9 dBA
  • Airflow (Max): 83.9 CFM
  • Air Pressure (Max): 5.31 mmH2O
  • MTBF: 300,000h @ 25°C
  • Bearing Type: Fluid Dynamic Bearing
  • Dimensions (W x H x D): 120 mm x 120 mm x 25 mm
  • Cable Length: 500mm
  • Connector: 4-pin
  • Weight: 227g
  • Warranty: 5 years
  • MSRP: 31.9€
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