Enos Tech has published an in-depth review of the Silent Wings PRO 4 White 120mm and 140mm PWM. The fans are known for their high performance and low noise output. They are especially suited for use with radiators. Some of the important points are that the fans have a detachable mounting system, fluid dynamic bearings, and a 5-year warranty. They perform great, especially on the UHS setting, leading to a Recommended award.