Noctua NF-A4x20 5V PWM, Premium Quiet Fan, 4-Pin, 5V Version (40x20mm, Brown)

I bought this fan for use with the Nvidia Jetson Nano. The Nano automatically turns the fans on and off on demand. Cant tell is the fan is on by noise generated because there isnt any. The only problem I had installing it was because the supplied screws were too short and didnt fit the holes in the heat sink. Temporarily used round toothpicks to hold it until I can find the proper screws.

Installed this fan on to a nVidia Jetson Nano and fit perfectly. I did get a case for the Jetson Nano that provided the appropriate screws that properly mounted the fan with though. This fan kit doesnt come with those as the parts that come with the fan are more used for mounting to a something like a computer case.

This fan is quiet, feels well built and works perfectly with my Jetson Nano kit.

Looked up the wiring diagram on Noctua to make sure I had it right, looked up an easy little PWM can script, and fired right up. Only had to plug it into 5V, Ground, and the PWM pin set in the script. Works awesome, and its the same price as the non-PWM fan. Its almost silent if youre right by it. If your more than a few feet away you wont hear it on high.

Im using this to cool a Raspberry Pi running a 3d printing server. It would overheat causing the printer to stutter - but no longer. This fan is impressively small delivering impressive airflow and virtually silent. Im very satisfied.

Its a little tall in proportion to the Jetson Nano but it works great.

easy to install, will buy again

Quiet as expected.

Super quiet fan. My workflow improved and I can record now without the fan Boise in background.

Unless Im running something intense, the PWM fan is usually off. Then when the Jetson Nano gets warm the fan turns on just enough to cool it. I never notice this fan - I have to look at the blades to see if its spinning because its so quiet. The default fan I replaced came with a third party acrylic Jetson Nano case, it was not PWM, always running full speed and a noisy little fan at that. Ive seen other comments on the default fan saying its not very loud. I suspect the low quality, default case fan varies in noise from unit to unit. If you want quiet - Get the Noctua PWM! I got the thick one, so I had to find some longer screws. I should have gotten the thin one which I expect would work fine and use the existing HW. At any rate, if quiet and sanity are worth a couple coffees to you, get the Noctua PWM fan, such an improvement over the default fan that came with the third party Jetson Nano case.