Noctua NF-A4x20 5V PWM Premium-Quality Quiet 40mm Fan

This is an amazing fan, it has such low noise I can barely hear. It’s speed is as per specification and helps with better heat management. Strongly recommended if you’re looking for a replacement for 5v PWM fan

Fantastica mini ventola dalle performance eccezzionali. Tiene a bada un miner BitAxe spinto alla massima frequenza, temperatura sui 52 gradi. Rumore appena percettibile. Con la ventola di default sembrava di stare vicino a una turbina con temperature oltre i 69 gradi. Super

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.

I'm using this fan to cool my Push 3 Standalone, which had a tendency to crash due to overheating after a few hours. It does the job perfectly as even after half a day, the Push's heatsink is still only luke warm even with the high summer temperatures. Still a bit noisy at 5000rpm, though, so I'll PWM to probably around 3000rpm and see from there. Overall, the quality is on par with what I was expecting from Noctua.

----- 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).