Review on ARCTIC P14 PWM - 140 mm Case Fan with Pressure-optimized PWM, Ultra Quiet Motor - Fan Speed: 200-1700 RPM - Black by Micha Jelonek ᠌

One of the 5 fans in the package crackles noticeably, another one is much less noticeable, but perceptible in silence, at any speed Pros below: -They look unattractive, do not catch the eye -Pull / purge well -Noiseless up to 900 rpm - The ability to connect fans to each other, saving connectors on the motherboard -Very low minimum rpm threshold (100-200) -Good price for relatively quiet and efficient fans, especially in comparison with Noktua - 3200/5pcs versus 2 for one fan Its cons: -After 900-1000 rpm (with a limit of 1700) they begin to buzz noticeably (do not rustle, buzz), after 1200 rpm the noise is strong -Bare equipment, only ordinary silver screws for fans, no vibration pads, extension cords, splitters and anything else