Question about be quiet! Silent Wings 4 Pro PWM fan

The Silent Wings 4 Pro PWM fan (120 mm) from be quiet and the Noctua NF-A12x25 PWM fans have several key differences and similarities:

## Noise Level
- The Silent Wings 4 Pro PWM fan has a maximum noise level of 36.9 dB(A) at 100% PWM/12V, which is relatively quiet but can be louder at its highest speed settings.
- The Noctua NF-A12x25 PWM fans are generally quieter, especially at lower speeds, and maintain a lower noise level even when normalized to the same volume as other fans.

## Air Pressure and Performance
- The Silent Wings 4 Pro PWM fan is designed to deliver high air pressure, with a static pressure of 5.31 mm H2O, which is beneficial for cooling demanding hardware and radiators.
- The Noctua NF-A12x25 PWM fans also provide strong air pressure but are optimized more for quiet operation and balanced performance. They excel in tests normalized to a specific noise level, often outperforming other fans in such conditions.

## Speed and Versatility
- The Silent Wings 4 Pro PWM fan has a maximum speed of 3000 RPM and features a speed switch that allows users to adjust the maximum RPM to 1600, 2500, or 3000 RPM, providing flexibility for different cooling needs.
- The Noctua NF-A12x25 PWM fans typically operate at lower maximum speeds but are highly efficient and quiet across their operational range.

## Overall Comparison
- In terms of maximum performance, the Silent Wings 4 Pro PWM fans often take the lead due to their high maximum speed, but they become louder in these conditions. The Noctua NF-A12x25 PWM fans are quieter and offer excellent performance when noise is a critical factor.

In summary, while both fans are high-quality options, the Silent Wings 4 Pro PWM fan excels in high-performance scenarios and offers more versatility in speed settings, but at the cost of slightly higher noise levels at maximum speeds. The Noctua NF-A12x25 PWM fans are quieter and more balanced, making them ideal for users prioritizing silent operation.