be quiet! Silent Wings 4 120mm PWM High-Speed
Expert rating8 / 10
- Fan Size:
- 120 mm
- Bearing Type:
- Fluid Dynamic Bearing
- Airflow:
- 76.7 CFM
- Max Speed:
- 2500 RPM
- Noise Level:
- 31.2 dBA
- PWM Control:
- Yes
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Manufacturer: be quiet! Last updated: September 10, 2026
be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) Review
The be quiet! Silent Wings 4 120mm PWM High-Speed is a 120mm case fan spinning to 2500 RPM for 76.7 CFM of airflow at 31.2 dBA, using a 6-pole motor and a fluid dynamic bearing rated for 300,000 hours.
be quiet!'s entire brand identity is acoustic engineering, the Silent Wings 4 High-Speed variant pushes that further than our existing Noctua option, higher max airflow at the cost of a higher noise ceiling at full speed, a legitimate alternative for builds that need more static pressure than the standard Silent Wings tune provides.
A 6-Pole Motor for Genuinely Low Vibration
Most case fans use simpler motor designs, be quiet!'s 6-pole motor is built specifically to reduce vibration and power draw at a given speed, part of why this fan can run at higher RPM than typical 120mm fans while staying in a reasonable noise band until you're near max speed.
300,000-Hour Bearing Rating
That's double the rated lifespan of many competing fluid dynamic bearing fans, if you're building something you don't want to think about again for a decade, that longevity rating is worth factoring in even if you never notice it day to day.
Comparison to Alternatives
Against our own Noctua NF-A12x25 PWM, Noctua's is quieter at a comparable speed but tops out lower on airflow, the Silent Wings 4 High-Speed pushes more air at the cost of some acoustic headroom at max RPM. Against Corsair's AF120 Slim, also new here, the AF120 Slim is a completely different use case built for clearance-limited builds, the Silent Wings 4 assumes standard clearance and optimizes for airflow and longevity instead.
Specifications
Identity and packaging
| Brand | be quiet! |
|---|---|
| Model | Silent Wings 4 120mm PWM High-Speed |
| Fan Thickness | 25 mm |
Design
| Fan Size | 120 mm |
|---|---|
| Bearing Type | Fluid Dynamic |
Performance
| Static Pressure | 3.96 mmH2O |
|---|---|
| Max Speed | 2500 RPM |
| Noise Level | 31.2 dBA |
| PWM Control | Yes |
Performance at maximum speed
| Airflow | 76.7 CFM |
|---|
Motor and bearing
| Rated Life | 300000 hours |
|---|---|
| Motor Type | Three Phase Six Pole |
Power and control
| Max Power Draw | 2.4 W |
|---|
Connection and daisy chain
| Connector Type | 4-Pin PWM |
|---|
Physical and finish
| Cable Length | 500 mm |
|---|
Market
| Warranty | 5 years |
|---|
| Source URL | https://www.bequiet.com/en/casefans/3701 |
|---|
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating8 / 10
More airflow than the quiet-first competition, with a bearing rating built for a decade of running.
Best for
- Builds needing more airflow than a standard Noctua fan provides and willing to trade a bit of acoustic headroom for it.
Not for
- Silent-first builds where the Noctua NF-A12x25 PWM's lower noise ceiling matters more than peak airflow.
FAQs
What are the key specifications of the be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr)?
The be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) is a case fan from be quiet!. Key specs: Fan Size 120, Bearing Type Fluid Dynamic Bearing (300,000hr), Max Speed 2500, Airflow 76.7, Noise Level 31.2.
Will the be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) work with my current setup?
The be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) lists Fan Size is 120. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) best suited to?
It suits builds needing more airflow than a standard noctua fan provides and willing to trade a bit of acoustic headroom for it..
What are the drawbacks of the be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr)?
It is a poor fit for silent-first builds where the noctua nf-a12x25 pwm's lower noise ceiling matters more than peak airflow..
Compare and read more
- be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) vs Cooler Master MobiusLink ARGB Fan (120mm/62.0 CFM/2.4 mmH2O Static Pressure/2000 RPM Max/30.0 dBA/Loop Dynamic Bearing/ARGB/PWM)
- be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) vs Corsair QX120 RGB (120mm/65.8 CFM/3.29 mmH2O Static Pressure/2500 RPM Max/34 dBA/Magnetic Dome Bearing/RGB/iCUE LINK)
- be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) vs EK-Loop Fan FPT 120 (120mm/74.55 CFM/3.36 mmH2O Static Pressure/2200 RPM Max/32 dBA/Fluid Dynamic Bearing/D-RGB/PWM)
- be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) vs EK-Vardar EVO 120ER (120mm/91.0 CFM/5.31 mmH2O Static Pressure/3200 RPM Max/36.6 dBA/Fluid Dynamic Bearing/No RGB/PWM)
- be quiet! Silent Wings 4 120mm PWM High-Speed (2500 RPM/76.7 CFM/31.2 dBA/6-Pole Motor/Fluid Dynamic Bearing 300,000hr) vs Thermaltake TOUGHFAN 12 (120mm/68.5 CFM/3.15 mmH2O Static Pressure/2000 RPM Max/30.5 dBA/Hydraulic Bearing/No RGB/PWM)