be quiet! Silent Wings Pro 4 140mm PWM High Speed 2400 RPM Premium Low Noise Cooling Fan | 4-Pin | BL099

After extensive research, I can confidently say the be quiet! Silent Wings Pro 4 140mm fan is a top contender in its size class. I scoured the market looking for the best balance of performance and noise levels, and this fan consistently came out on top. The only real competition I found was the Noctua NF-A14, but that's a significantly older model that hasn't seen revisions in quite some time. While the NF-A14 is a strong performer, the Silent Wings Pro 4 offers more modern features and refinements.My advice to anyone considering a 140mm fan: definitely check if Noctua has released a new revision of the NF-A14 (similar to their updated NF-A12). If they have, compare the two. However, as of right now, the be quiet! Silent Wings Pro 4 is the clear winner in the 140mm category. It delivers exceptional performance with minimal noise, making it the perfect choice for demanding builds where airflow and acoustics are equally important. Don't waste your time searching – if you need a 140mm fan, this is the one to get.

Amazingly quiet. Case is very cool. All my fans/cpu cooler are bequiet. Love the brand.

Definitely the best fans I've ever purchased. Solid, high build quality, and they move a lot of air.

Ordered 4. Great temps and very quiet. I use High modes for my 140s and the highest for my rear 120

I used Silent Wings 3 on my last computer build in 2018 and was very happy with them. In 2024 I did my latest build using the Silent Wings Pro 4 fans (7 of them) and it's really hard to hear them most of the time. I do hear them kick in for a few seconds at a time occaisionally when heavy loads hit the cpu. I highly recommend!

I ordered 4 of these and when package was delivered I was surprised by the weight just picking box up. When I took these fans out I was blown away by the quality just holding them. After installing them these are probably the fans I'm going to go with from now on. They're just fantastic. They are super quiet even at the highest RPMs which are also really high for a 140mm fan at 2400rpm.

This fan is great! 140mm is the right size for me but what's even better for this fan is that you can swap out the corners for different needs as well as noise dampening bumpers. The connections is high quality and well made and it can barely be heard in my mid-tower case

Moves a lot of air on the normal setting. Using the high performance mode on these fans sounds rather loud. I don’t know how much use you would get out of the selectable fan speed.