be quiet! Silent Wings 4 BL116 white PC case fan 140 mm PWM 4-pin low noise 13.6 dB 1100 rpm

Got this to fit between the fins on my cpu cooler because the motherboard did not have room for the fans that came with it. This one works perfect and is very quiet.

Fans are working flawlessly. Rubber mounting system makes installation a breeze, eliminates the need for screws.

Great fant multiple vibration free mounting options, inaudible even at two thirds rpm

Excellent fans, inaudible even at 2/3 rpm. Great mounting options

It's a bit expensive for single fans, but it's quieter than the stock corsair fans that came with the 4000 case, and I used the anti-vibration brackets that came with the silent fans. What I mean is that I set both stock fans to max around 1200 rpm, and then the silentwings fans to half max around 1200 rpm, and the silent ones are very silent. You could hear that these bearings were higher quality. I couldn't tell a difference in sound between idling and at half max. What's better is that the max is 2400 rpm, and my pc and my hand could feel the stronger airflow. Although, running them near max will definitely be noisier, it really feels nice to have everything running at a lower temperature than before on load (7-10°C less)