Noctua NF-A4x20 5V PWM, High-Performance Quiet Fan 40mm

Super quiet. Switched out standard fans on a bitcoin miner to these and it makes it super quiet.

----- 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 V ASIC Frequency: 475 Mhz Fan RPM Setting (Manual): 75% Caizhu Fan: 6,896 RPM Bitaxe Power: 12.0 Watts ASIC Temp: 47°C Expected Gh/s: 606 Run Time: 15.043 hours Average Shares p/Hour: 378.052 (Total Shares this Session: 5,687) Shares p/Rejected: 145.821 Average Rejected p/Hour: 2.593 (Total Rejected this Session: 39) Gh/s Ranges: 473-810 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.6M Noctua Fan: 5,538 RPM Bitaxe Power: 11.6 Watts ASIC Temp: 46°C Expected Gh/s: 606 Run Time: 15.211 hours Average Shares p/Hour: 380.436 (Total Shares this Session: 5,787) Shares p/Rejected: 170.206 Average Rejected p/Hour: 2.235 (Total Rejected this Session: 34) Gh/s Ranges: 442-802 Efficiency Ranges: 17-21 J/Th Best Difficulty (this session): 4.01M Now, 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).

It's not super loud, but it is still quite annoying at full speed in a quiet room. It does have PWM though, but it is an additional bother to enable it on a Raspberry Pi and I kind of hoped it could be left on full without being noisy.

Noctua... The best product, the worst looks. Love the passion for detail!

Got this on my Gamma 602. Along with a few other mods the miner is steady at 1.75TH/s and so much quieter than with the stock fan. Do not hesitate.

I mean, Its a noctua fan. What more do I have to say? It is exceptionally quiet. Pushes a nice amount of airflow for its size.

Very nice High quality replacement fan. I used it to replace a Dyeing OEM fan on a Fan kit for a USB Miner. See: https://www.amazon.com/dp/B0BKRD5BM3?psc=1&ref=ppx_yo2ov_dt_b_product_details Takes a bit of basic skills to swap out. Snipping wires on the Original Fan USB A cable, and then connecting it to this fan using supplied connectors or soldering then Shrink tubing / insulation. If your skilled and picky use soldier to connect then insulate individual wires. Works well, more blades than the Original fan, super quiet as a new item. Time will tell.

The best fans that you can buy for your application. Very durable and well built The included hardware is top notch and the splitter is such a welcome addition to have. I have three of these all cooling my BitAxe miners and they are very efficient and quiet, even when running at higher rpm's. Expect Noctua fans to last longer than your electronic device. Just clean then every so often of dust that can accumulate on the fans and you can expect them to have a very long lifespan.

Noctua NF-A4x20 5V PWM kutusundan USB kablosu çıkmadı, araştırdığımda zaten buna USB güç kablosu dahil olmadığını farkettim. Ürün açıklaması yanıltıcıydı. Şimdi ürünü iade edip yenisini 15gün beklemek zorundayım. 40x10mm boyutlarındaki ürüne USB kablosu dahil sanırım belki birinin işine yarar bu bilgi. Noctua NF-A4x20 5V PWM ürünğnden USB güç kablosu çıkmadı.

Ever wondered why that fan makes such annoying noise? Well no longer with Noctua. This is one of the quietest fans that I have used to date. Especially those smaller fans make a lot of noise. Besides that this fan has a great ball bearing, it also comes with rubber vibration cancellation connectors. These easy to use rubber connector are easy to place in your case, and even easier to thread through the fan to fasten them in place. Over the years I have replaced a great amount of fans with those from Noctua.

This is a straight replacement for the fan for the bitaxe gamma and it has the exact same size and shape so if you have a dtv bitaxe gamma with hr full case. It fits perfect. The connector is a straight fit so you just take it out the box and replace the existing fan plugging this one in. It is practically silent which is aassove upgrade on the existing fan and with the standard cooler, the same temperatures.

Acquistata in sostituzione della ventola di serie, si conferma una soluzione eccellente, caratterizzata da prestazioni elevate e massima silenziosità. L'integrazione del cavo a Y in dotazione mi ha permesso di usarle entrambe, rendendo il dispositivo ideale per l'impiego operativo con Bitaxe.

Una mosca hace más ruido jaja. Es perfecto!