SilenX iXtrema 120mm 11dBA Fan Are they quiet? Do they cool?

At full speed, these fans are very quiet. The only audible noise is a "whoosh" of air, but it's very soft and tolerable. The whoosh is not harsh at all and doesn't have a hint of a whistle. The fans don't vibrate at all, even when mounted with the steel screws. Nor do they generate resonance, which is impressive in a 1.2mm aluminum case.

Lowered to 7 volts, the "whoosh" vanishes and the fans are much quieter than they are at 12V. At 5V, the fans are almost silent from 3 feet away - I can barely hear them when the side of the case is closed. From 3 feet away, these fans are close to silent.

Click to expand...