The be quiet! Silent Wings 4 140mm focuses on low noise output, while keeping performance at decent levels. You cannot expect of course from a silent fan to offer top airflow and static pressure, some compromises have to be made.
The be quiet! Silent Wings 4 line consists of high-quality fans, focusing on low noise output. The noise output remains low thanks to the 6-pole fan motor, the fluid dynamic bearing, and the low rotational speeds. be quiet! suggests these fans for radiators, heatsinks, and cases despite the low speeds. After I have finished all testing sessions, I will have a clear image of their performance, so it will be easy to suggest the best usage scenarios.
There are two major lines: Silent Wings Pro 4 and Silent Wings 4. The first comes in two flavors, 140mm, and 120mm, while the last comes in six versions:
- 140mm PWM high-speed
- 140mm PWM
- 120mm PWM high-speed
- 120mm PWM
I will check the Silent Wings 4 140mm PWM in this review, which can spin up to 1100 RPM only, while its high-speed sibling can go up to 1900 RPM, making it more suitable for cooling solutions.