Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm, Brown)

Very quiet fan, happy with it

I bought a POE switch (Drayek 1282 to be exact) - I had plans on mounting the switch to the wall behind my desk. I work in data centres a lot, so it shouldn't have surprised how loud the thing was. I took a gamble and bought a couple of these fans. The swap out was very easy - most PC kit will want a 12v fan (in case you were wondering to go with the 5v or 12v variant). The fans ship with everything you could need. My OEM fans connected to a 2 pin header on the main board. I cut the connectors from the old fans and used the included "OnmiJoin adaptor kit" to hook the new Noctua fans up to the original connectors. Again very easy. Mounting the fans in the chassis was easy as well. On power up the drop in noise was significant. Degrees of magnitude quieter. I ran for a day to check switch temperatures were staying low - all good. With that working well, I cracked open the switch again and added the (included) low noise adaptor - this just slows the fan RPM down a bit to reduce the fan noise. Again noticeable difference. Am now at the stage where the switch is under my desk and I can't hear it above the background noise anymore. Bearing in mind that with the OEM fans the noise levels were at the "extremely annoying " level on the other side of a closed door. Very happy - just wish I'd videoed the whole process.

If you have a flex PSU for pc building ; especially in a SFF build. This totally transformed the fan noise This is the best upgrade for a flex PSU The standard fans with my flex PSU sounded like a jet engine This takes the level below CPU fan noise level Pc case was a jonsbo nv10

The Noctua NF-A4x20 FLX is a premium quiet fan known for its exceptional build quality and performance. Designed with advanced aerodynamic engineering, this 40x20mm fan provides efficient cooling while maintaining low noise levels. Its 3-pin connector ensures broad compatibility, making it ideal for a variety of applications, from computer cooling to DIY projects. Users appreciate its robust design, long lifespan, and the inclusion of multiple mounting options. Overall, the NF-A4x20 FLX is a top choice for anyone seeking a reliable and silent cooling solution.

Good value for money, with good speed and airflow. Maybe slightly more load than I was expecting but that might be because of the airflow in my storage bay. It is certainly much quieter that the factory fan that the storage bay came with. This also came with adaptors that enabled me to use the original 2 pin connector, I just cut the wire from the original fan, attached the adaptors and it worked just fine. It only took me 10 mins to complete the installation so very easy. Happy with the item!

Fantastic product incredibly quiet

What an amazing difference between this and the original fan in my device. I used it to replace a fan in a CCTV box and now I cannot hear the device at all before it had a very loud fan noise. It has been in there over a month constantly on and no issues. The box is not over heating and it is silent even when you are close Packaging for the fan is excellent with lots of different cables and mounting options. Not cheap but if you want to get the job done and done right this is the way to go

Bought as replacements for an old and noisy Netgear network switch. They don’t have the right speed sensing signals that the switch is expecting, so it displays “fault” against them but I knew that before purchasing so isn’t an issue for me. The main improvements as you would expect is the noise, they are significantly quieter than the ones being replaced which you could hear from a different room, but still move a decent amount of air and keep the switch at a good temperature. Does everything you would expect of a fan, and everything you would expect from a Noctua fan in particular.

I bought a new TP-Link Switch and it was ridiculously noisy. I mean, I get that its supposed to live in a server room but surely they could've done something to tone it down a bit. Two of these to replace the ones inside the switch have made it almost silent while still providing sufficient airflow.

I have replaced stock fans from my Unifi Ubiquiti USG Pro and I here the sound barely, before with stock fans I mom used to complain about noise while she was in other bedroom. Now no sound from the fans at all, for your reference I am not using any low noice adaptors. I will purchase two more to replace in 24 port PoE switch.

Works great in my switch, way quiter and moves the same amount of air.

安定のノクチュアです ウンチ色じゃなければ全てのファンをノクチュアに交換したいくらいです

Very nicely packaged and has all the connections needed for different situations