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

----- Start of Update 12OCT24 -----The Noctua Fan had previously received many high regards, so I decided to run it longer term and compare it with the orginal Caizhu Fan on the Bitaxe 401 Supra.One can fully customize the settings to run at varying input voltages and pair them up with varying frequencies. I just "picked on" one setting and ran the Bitaxe with the original fan (Caizhu), then the Noctua, as follows:ASIC Voltage Requested: 1.166 VASIC Frequency: 475 MhzFan RPM Setting (Manual): 75%Caizhu Fan: 6,896 RPMBitaxe Power: 12.0 WattsASIC Temp: 47°CExpected Gh/s: 606Run Time: 15.043 hoursAverage Shares p/Hour: 378.052 (Total Shares this Session: 5,687)Shares p/Rejected: 145.821Average Rejected p/Hour: 2.593 (Total Rejected this Session: 39)Gh/s Ranges: 473-810Efficiency Ranges: 17-21 J/ThBest Difficulty (this session): 4.6MNoctua Fan: 5,538 RPMBitaxe Power: 11.6 WattsASIC Temp: 46°CExpected Gh/s: 606Run Time: 15.211 hoursAverage Shares p/Hour: 380.436 (Total Shares this Session: 5,787)Shares p/Rejected: 170.206Average Rejected p/Hour: 2.235 (Total Rejected this Session: 34)Gh/s Ranges: 442-802Efficiency Ranges: 17-21 J/ThBest Difficulty (this session): 4.01MNow, other settings can render different results, but I will just say the obvious, the Noctua doesn't need to spin faster to move more air, it's designed that way, it's why it's good (and I was too quick to judge). It allowed the Bitaxe to consume a bit less power, run 1°C cooler and was also a bit more efficient in the long run.After giving it a fair shake over the last week, I prefer the Noctua over the Caizhu and I know someone else in the house that REALLY appreciates how quiet it runs. I would purchase a Noctua fan for any future Bitaxes that I acquire.Rating increased from 4 to 5 Stars.----- End of Update 12OCT24 -----The NF-A4x20 5V PWM came in a fancy package, with wiring adapters and mounting hardware.I just needed the fan.This fan is the fastest of the Noctua fans, rated at 5,000 RPM +/- 10%, which mine ran at just over 5,400 RPM when I installed it on the Bitaxe 401 Supra.I was disappointed to find that at MAX RPM (5,400), it did not move more air than the stock CAIZHU-FAN (I ran it at 6,750 RPM, or 88% fan speed on the Bitaxe).Even at the MAX speed of 5,400 RPM, the Noctua allowed my Bitaxe to run 6°C hotter than with the CAIZHU-FAN at 6,750 RPM (88% of MAX speed).Furthermore, this Noctua fan causes my Bitaxe to consume 16.2 Watts, versus 15.2 Watts with the stock fan. So, in short, it moves less air and consumes more power :^|On the other hand, the Noctua runs extremely quiet, as advertised "14.9 dB(A)", while the CAIZHU-FAN runs a bit noisy, especially when passing 5,000 RPM.It's up to you.Do you want to run your Bitaxe hotter by 6°C and consume an extra Watt of Power, but it's much quieter?Do you want the sound of the fan in the background, evidence of work in progress, but the Bitaxe runs better?If Noctua would make a 40x40x20 5V PWM fan that was rated at 8,000 RPM, I would love to compare that in operation to the stock CAIZHU-FAN on my Bitaxe 401 Supra. If it cools more, I would be a fan of the Noctua (pun exquisitely intended).

Excellent fan! Works excellent, it was boxed great and shipping was SUPER FAST!!!vA

Unless I'm 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 it's spinning because it's 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. I've seen other comments on the default fan saying it's 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.

This mini fan is cooling my fiber modem and works 100% better than the raspberry pi fan I was using and it's quieter! 5v 4x20

Got this to replace the stock fan on a bitaxe, works good and is silent. Would buy again.

It's quite good as far as the fan itself, but the connector wire is quite long and it's not modular, so if you want it to fit neatly into a Bitaxe case, you might have to do some cutting and soldering to shorten it. It's not necessary to shorten it but the wire will stick out quite a way.

I bought this for my NVidia Jetson Nano because it was recommended by the Geekworm case I bought.I was extremely skeptical about all the "quiet" branding but I was feeling lazy and wanted to guarantee it would fit my case so I bought it anyway.Fast forward a couple days and I started doing some work on the Nano, and I couldn't hear the fan at all. Concerned that I might have plugged it in wrong, I bent down to check, and I was pleased to discover that it was running at full blast but I couldn't hear a THING. I had no idea fans could work this well and I'm thinking about replacing all the old, whiny fans in my desktop with Noctuas now, haha.

This is a very good fan that fitted well on my Nvidia Jetson Nano. It has a very low noise when it is running at full speed. I did some experiments by running various loads on the CPU to see how it behaves and it worked really well to keep the CPU temperature at the set value.It has a very pleasing color combination for the fan and the outer cover. The package comes with attachments (cables) and screws. The only problem I had fixing it on the heatsink was that the screws were slightly bigger than the heat sink, but I just swapped it with another set of small screws that fit well.