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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Noctua NF-A4x10 FLX, High-Performance Quiet Slim Fan 40mm | High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin

Noctua NF-A4x10 FLX, High-Performance Quiet Slim Fan 40mm | High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin

Product ID: 1476697

Details

Air Flow Capacity
8.2 cubic per
Brand
Noctua
Compatible Devices
Desktop
Cooling Method
Air
Material
Fibre-glass
Maximum Rotational Speed
4500 rpm

🌀4500/3700 RPM dual-speed power

📏Slim 40x40x10 mm compact design

🔇Ultra-quiet 17.9 dB noise level

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Description

🌀 Quiet power in a slim package — cool smarter, not louder.

VIBRATION FREE OPERATION - Includes anti-vibration mounts and premium accessories to ensure stable, noiseless performance that won’t disrupt your workflow.
ULTRA COMPACT SLIM PROFILE - At just 10mm thick, this fan fits seamlessly into tight spaces—perfect for sleek, minimalist setups and compact electronics.
PRECISION DUAL SPEED CONTROL - Switch effortlessly between 4500 RPM for max airflow and whisper-quiet 3700 RPM for stealth cooling.
AWARD WINNING ACOUSTIC ENGINEERING - Flow Acceleration Channels and Advanced Acoustic Optimisation deliver superior cooling with minimal noise—because silence is the new luxury.
BUILT TO LAST WITH INDUSTRY LEADING WARRANTY - Over 150,000 hours MTTF backed by a 6-year manufacturer’s warranty—reliability that keeps your gear cool and your mind at ease.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V slim fan designed for high-performance, ultra-quiet cooling in compact electronics and PCs. Featuring dual-speed settings (4500/3700 RPM), advanced acoustic optimization, and anti-vibration mounts, it delivers efficient airflow at just 17.9 dB noise. With over 150,000 hours MTTF and a 6-year warranty, it’s the go-to choice for professionals seeking reliable, silent cooling in tight spaces.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 cubic meter per hour
Best Sellers Rank	#45 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (11,256)
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Item Dimensions L x W x H	1.57"L x 0.39"W x 1.57"H
Item Weight	50 g
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	4500 rpm
Model	NF-A4x10
Noise Level	17.9 db
Number of Items	1
Number of Packs	1
Part Number	NF-A4x10
Power Connector Type	3-Pin
UPC	163121136772 809185325669 806291857176 804066543873 842431014054 102930672934 782386476753 172302657890 132017920719 808111662861 809385174852 168141421648 851905102548
Unit Count	1 Count
Voltage	12 volts
Warranty Description	6 year manufacturer’s warranty

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25157CFA

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In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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