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

Pretty silent cooler for Raspberry Pi tower. Main chip temperature can be reduced to 35 degrees.

Just to be safe since my ASUS Prime Z390 a mother board was air-cooled, added this fan since the motherboard supported a 40 or 50 mm fan for cooling the heatsink on M2 SSD. Also attached temp sensor to M2 heatsink, Asus software controls fan speed automatic, great solution.

Product advertised as quiet, sounds like a rocket ship. Too loud for silent setup use. Will be returning.

Fantastic high quality fan. It is amazingly silent and includes many adapters and extras. Packaging and instructions are top notch. You really get what you pay for.

Kind of forced to use noctuas because the only other 40mm 5v 4pin fans available are tied to the Jetson nano and they straight didnt work for me so i had to get these puke colored babies which worked like a charm.

Quiet as expected.

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

I was blow away by the quality of this fan. The details, the material feels like it will last a really long time. You can tell people did lots of research.

Title says it, this fan does a great job at cooling a raspberry pi 4. With a little modification to the case

I use M2.5 screw and M2.5 nut as washer.