This might be a dumb question, but what is the operating voltage? Don't see a rating anywhere in the description or reviews and hoping it's 12VDC.

12 volts DC. 3 pin connector but comes with a 2 pin adapter and extension cables.

Have anyone used this to replace the 35 mm assist fans on an asus sabertooth z87?

I have it in my Asus Sabertooth Z170 S and it fits just fine! (just remove the two Anti-Vibration Pads in contact with the TUF Armor to be able to close the lid). Take into consideration that in my version of the Sabertooth, the assistant fan position is vertical, inside the TUF Thermal Armor, between the IO Shield and the heatsink VRM, and works as an intake fan, to blow fresh air into the motherboard. Every Sabertooth Assistant Fans are designed to work differently. I believe in your motherboard the fan is place horizontally, on Top of the TUF Thermal Armor. Also the fans needed for your Sabertooth Z87 had a mini 3 pin connector, my motherboard use 3 or 4 pin (regular size) connectors. Therefore the original assistant fan of the Sabertooth Z87 cannot be plugged in the Assist Fan 1 connector of my Sabertooth Z170 S. I know this because I was looking for the fans for my motherboard and buy the Z87 version by mistake, couldn't use it, so I buy the 40mm Noctua, and it works great! Really improved the temperature inside my case. Also my motherboard use 40mm fans. I'm not sure of the Z87 assistant fans size, but putting the two of them together, are exactly the same size, only thing adding up to the size variation, are the Noctuas silicone anti vibrations pads, that can be removed. Hope this helps even a little bit.

What is the sound decible rating

http://noctua.at/en/products/fan/nf-a4x10-flx/specification 17.9

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NF-A4x10 FLX, Premium Quiet Fan, 3-Pin Connection (40x10mm, Brown)

Product ID: 735272421

Details

Product Dimensions
40L x 40W x mm
Brand
Noctua
Power Connector Type
3-Pin
Voltage
12 Volts
Cooling Method
Air
Compatible Devices
Desktop

⚡12V 3-pin flexible power

🌀4500 RPM max speed

🔇Ultra-quiet 17.9 dB noise level

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1328909₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Small Fan, Big Impact: Quiet Power for the Modern Pro

BUILT TO LAST - Backed by a 6-year warranty and an impressive MTTF of over 150,000 hours, this fan is engineered for relentless, reliable cooling.
COMPACT POWERHOUSE - Ultra-slim 40x40x10 mm form factor fits seamlessly into tight spaces like 3D printers, NAS devices, and network gear without compromise.
WHISPER QUIET COOLING - Experience near-silent airflow with industry-leading 17.9 dB noise levels—perfect for focused workspaces and serene home offices.
PRECISION SPEED CONTROL - Dual-speed FLX design lets you toggle between 4500 RPM for max airflow or 3700 RPM for ultra-quiet operation, tailored to your environment.
VIBRATION FREE PERFORMANCE - Includes anti-vibration mounts and OmniJoin adapters for effortless installation and rock-solid stability—no rattles, no distractions.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V 3-pin fan designed for ultra-quiet, high-performance cooling. With adjustable speeds up to 4500 RPM, advanced acoustic optimization, and anti-vibration features, it’s ideal for compact devices like 3D printers, NAS, and network equipment. Engineered for longevity with a 6-year warranty and over 150,000 hours MTTF, it delivers reliable airflow with minimal noise, making it the go-to choice for professionals demanding silent efficiency.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Meters Per Hour
Amazon Bestseller	#62,866 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #151 in Electronic Cooling Fans
Brand	Noctua
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 out of 5 stars 10,953 Your Review
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Item Dimensions L x W x H	40L x 40W x 10H mm
Item Weight	50 Grams
Manufacturer	Noctua
Material Type	Fiberglass reinforced PBT
Maximum Rotational Speed	4500 RPM
Noise Level	17.9 Decibels
Power Connector Type	3-Pin
Product Dimensions	40L x 40W x 10H mm
UPC	163121136772 809185325669 806291857176 804066543873 842431014054 102930672934 782386476753 172302657890 132017920719 808111662861 809385174852 168141421648 851905102548
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	6 year warranty

Reviews

T**E

アイネックスの5Vケーブルでも正常動作確認

このファン自体は12Vだが5Vケーブルでも1500rpmで動作しました。 1500rpmだと微風ですが全くの無音。半値で変える静音ファンもありますが3300rpmと高速なので5V駆動でき無音な理想的なファンでした。

31.03.2023

D**I

使える

使える！しかも煩くないが高い

6.01.2026

T**S

真横で寝られるくらいの静かさになります。

3Dプリンタ（i3 mega）のステッピングモータードライバとホットエンドを冷却するファンがうるさいので、静音化のために購入しました。あまりにも静かなので本当に回ってるのかと疑ってしまいました。交換する前は、うるさくて2階に置いてあるのに1階でも聞こえるくらいの音でしたが、交換後は真横で寝られるくらいの音になりました。コネクタピンが合わなくても、既存ファンのコードを切断してピンを使えるように、UYコネクタも同梱されててありがたいです。他のファンよりも高めですが、かなりおすすめです。

30.09.2019

青**裕

静音で定評のあるNoctua製

NVRに内蔵しているFANが異音を発生するようになったので、代替品として、静音で定評のあるNoctua製のFANに交換。音はオリジナルより静かで、風量は変わらず。耐久性はこれからなので、未知数。

13.11.2021

A**R

驚きの静かさ

ANYCUBIC MEGA-Sのホットエンドのファンがうるさいので交換。最初はあまりに静か過ぎてファンの羽根を止めたりして回ってるのを確認したくらい静かです。消費電流も0.12Aから0.05Aに下がって言うことなしです。静かなファンを探してるなら買いです。

5.12.2020

H**・

問題ありません

電源ファンの交換用に購入しました、稼働音は小さいです。

13.09.2024

H**8

Great product with excellent packaging

Good performance, low noise, very compact.

5.07.2019

蘭**ん

Ｅnder3制御基板用冷却ファン

Ender3 Pro制御基板用冷却ファンとして購入一度ANVISION DC 24Vに交換し少し静音化しましたがやはり静音性に満足できず少し高価でしたが、海外のyoutuber一押しのこのファンを購入しました大変満足しています。悩んでる人は迷わずこれ購入してください

2.01.2021

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