Noctua NF-A4x10 PWM, High-Performance Quiet Fan 40mm

Yep. Noctua wins again! For those not familiar with fans and their intricacies, smaller fans often tend to be louder than larger fans. Tiny tiny fans like those 40mm and under can be painfully annoying as the RPMs reach breakneck speed. Noctua managed to keep the hub size so tiny, that there is actually room for air to move through the fins, instead of squeezing through the gap between the hub and the shell. This prevents that painful “whizzing” noise heard on most small fans. The engineering behind doing that is tricker than it seems, but Noctua doesn’t disappoint. It is DEAD quiet and moves decent air for the little fella. Great addition for hobby projects and PC mods. And as always, Noctua includes every adapter and amenity under the sun. The convenience included is alone worth the price. Spend the bit extra couple dollars, your ears and components will thank you.

Beautiful piece of engineering. And the packaging... Wow. Speechless. They've included everything you might need. The airflow is weak though, but what would you expect from the fan of this size. Oh yeah! And it's super quiet.

Used to replace original Asus ROG Strix Z390-E chip set fan. Fan is almost silent and moves plenty of air. My opinion, Noctua fans are the best. All case fans have been replaced with Noctua's fans and no complaints.

Perfectly fit my custom HBA fan mount for my home server. Great fit, great cooling and low noise.

I use this fan for extra pin point cooling of my motherboard chipset. This little fan ramps up and down all day long and has been do that for nearly a year now with no signs of failure, I'm impressed with it. It does sound like a little jet engine at full speed but most of the time I hardly notice it. When the system heats up all the other fans usually ramp too, so it's not the sole offender, but it is a little workhorse.

Cools an SAS HBA card pretty well. I did have to use zip ties in order to attach it. But that is not really a surprise.

Needed a solution for a RAID Controller (PERC H730) that was continually running at 52c in a Fractal Design Node 304 case. Designed and 3D Printed a bracket for it, installed on the same port as the rear fan so it's cranked up pretty good. It's almost silent, and took my temps down to 38c continuous. Absolutely worth the cost.

I bought this to cool an LSI 9207-8i HBA (https://www.amazon.com/dp/B0085FT2JC), and it seems to be doing fine. This fan moves (at top speed) just under 5 CFM at just under 20 dB, which seems pretty typical. PWM means it can be connected to a PWM fan header to control its speed for even less noise, although even at full throttle, it's hardly audible a few feet away. It also comes with a boatload of accessories, including a PWM-capable Y adapter that allows connecting 2 fans (more, if you chain adapters) to a single header. Overall, I think it's a good choice for a quiet 40mm fan. (I'd imagine the Noctua A4x20 is also solid, however it appears to trade slightly higher airflow and double the height for a wider "dead zone" in the middle, which for my use — the fan is mounted directly on a heat sink — wasn't ideal.)

sony α7シリーズの空冷に使用しています。 バリアングルモニタを開けた隙間にジャストサイズで入り、別途固定具を必要としないほどかっちり嵌ります。 動作音は期待通り静かで、同等の小径ファンに比べれば明らかにノイズが低いです。 風量もあり、静音ファンの名に恥じない性能でした。

My PC's CPU temperature was low (35 – 52 degrees). However, the Z690 chipset was hovering around 80 – 90 degrees. Way too hot for my comfort. Made a simple mod by zip tying a 4cm Noctua fan to blow directly at the chipset heatsink. The temperature drops to between 61 and 69 degrees. ASUS made a mistake of removing the heatsink fan for aesthetic reason.

incredibly quiet even at full speed. been running this in my pc case for months now and honestly forgot it was there until i looked at the temps. cooling is solid, nothing fancy but it moves air efficiently. the pwm connector works flawlessly with my motherboard and the fan ramps up and down smoothly as needed. build quality is excellent, feels premium compared to generic fans. only real downside is the premium price tag but if you want to swap fans and keep your system quiet this is the right choice. no vibration even when ramping up.

Excelente producto al inicio pensaba que era demasiado caro para un ventilador tan pequeña, pero de verdad que sí fama lo precede. Lo instale en una impresora 3d y me va de maravilla comparado con el que traía este es mucho muy silencioso, la verdad estoy muy satisfecho con la calidad de este producto

Its Noctua need I say more. It will replace my Tronxy CoreXY printers system fan, have also replaced the hotend cooling fan with noctua as well.