🌀 Wathai 40x40x20mm 5V 2Pin DC Case Fan: Efficient Brushless Cooling Solution Review

They blow about 50% more air than the Noctua equivalent Noctua NF-A4x20 FLX and are not very loud in comparison. I replaced the superfluous power supply fans, which were very loud, with Noctua, which, however, triggered an alarm due to overheating under heavy load. When I replaced the Noctua with the Wathai, the alarm stopped working and the background noise remained quite acceptable. I'm so glad I found such fans!

The product is a high quality fan. It pushes a lot of air, which is to be expected based on the specs. 40mm fans that push a lot of air are known to make noise, but it seems to be louder than 22dB. From what I've noticed, if you're looking for something quieter, you're going to have to find a 40mm fan that spins under 3500 rpm and sacrifice airflow.

For a 5V fan it pushes a good amount of air. I use it to cool my Odroid XU4 and it works great for the job. My XU4 has a Northbridge heatsink and anyone familiar with this single board computer knows that it's not enough to cool under load. This fan isn't all that loud, more because it's not perfectly balanced and that's all you can ask for from a cheap fan. You can always remove the blade and balance it yourself if you want quiet operation. It keeps my XU4 cool in everything except a long…

This fan was a great replacement for the fan in my DVR. As the cheapest option, it was slightly louder than the fan it replaced. With a little special mount isolation I was able to eliminate the vibrations and the noise level was acceptable.

This fan solved the noisy fan in the Schmacher charger that was driving me crazy. The SSC 1000a was loud from the start and got worse the year I had it. This fan saved me from buying a new charger. Custom-fit and directly connected to the SKT. On board. Significantly quieter than the original fan. Time will tell how long it will last. Happy with the purchase and the fast delivery.

Read the description carefully. This product does not match the characteristics of what was entered in the search. It's 12 V DC

These fans appear to move a lot of air, but they produce a very loud hum at a frequency that makes them unusable on my desk. I literally heard them all over the house. I ended up replacing them with a Noctua fan. I'm keeping them and can use them on a project where noise isn't an issue.

This fan is noisy but I have since ordered 2 more from other sellers and they are all noisy. This is a fan for my security recorder. I've found that QUIET fans don't move much air at all. I actually bought and tested a new DVR, it is very quiet but there is very little air movement which could explain the premature failure of the HD in mine. I think I'll live with the noise and extend the life of the HD.