Noctua NF-A4x10 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x10mm, Brown)

I used one of these to replace the noisy fan in my Q-See DVR that I bought at Costco. This one is much quieter but not totally silent. Id say it is probably about half as loud as the original, so it is well worth it. Comes with every imaginable connector to adapt to whatever you have, which is nice. On a Q-See DVR, you will not need any of those adapters.

I buy these for my raspberry pi projects. I power them directly from the pis 5 volt. They are very quiet fans.

Despite wondering why I was paying $14 for a tiny fan, I dont regret this purchase. I have this installed in a custom case for a Comma.ai self-driving device in my car. It keeps the device cool and is nearly inaudible with the car running. I can also trust that this thing will outlast the Comma device itself. A cheaper fan may have accomplished one or two of these things, but it sure wouldnt be able to do all 3.

I have several of Noctuas fans in my PC: NF-F12 iPPC 3000 PWM, NF-S12A PWM, NF-P12. They are very effective at keeping my severely overclocked system cool, and while they are very quiet, I still do hear them. This one though, the NF-A4x10, I dont hear this one at all. I can be in a silent room and still not hear this fan, but it moves a lot of air for its size.

This fan is awesome. I bought this to replace the exhaust fan on my Amcrest DVR. With the original fan it measured about 55 dB from a foot away. With the months fan it measured 35dB. Feels like it puts out as much air if not more. I used the silicon mounts it came with and it holds it very secure but doesnt allow noise from the fan to resonate through the chassis of the DVR. Definitely worth the money.

Much quieter than the stock fan that came with my Odroid xu3 Lite.

I have a heatsink for my raspberry pi that I picked up that was both noisy AND annoying as it had LEDs on the fan. Swapped it out with this fan and, while I see it spining, from a distance I hear nothing! absolutely quiet AND I am running my Pi4 24/7 at 34.56 C / 94.2 F... had to take the heatsink off to make sure the sensor was working!

The only problem is that the cord is a bit too long for a MiSTer, but that is hardly a dealbreaker.

Great fan - it blows!

I used this to repair a fan in an old ClearOne XAP 800. It worked beautifully without making a lot of noise. The installation kit was very complete and i didnt worry a bit about it possibly not being able to connect. It has been running non-stop now for a month or so with no signs of slowing down.