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, Premium Quiet Fan, 3-Pin (40x10mm, Brown)

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

⏳>150,000 h MTTF for long-lasting reliability

🌀4500/3700 RPM dual-speed control

🔇max. 17.9 dB(A) ultra-quiet operation

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Description

🌀 Elevate your cooling game—quiet, compact, and built to last!

COMPACT POWERHOUSE - Ultra-slim 40x40x10 mm size fits perfectly in tight spaces like 3D printers, NAS, and network devices without compromising airflow.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization—no more noisy distractions during work or play.
PLUG PLAY VERSATILITY - Comes with 3-pin Molex connector, extension cable, and OmniJoin adaptor set for seamless integration with proprietary fan headers.
PRECISION SPEED CONTROL - Dual-speed FLX design lets you fine-tune between powerful 4500 RPM or whisper-quiet 3700 RPM modes for tailored performance.
VIBRATION FREE OPERATION - Includes anti-vibration mounts and premium build materials to ensure smooth, stable, and noiseless performance.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V 3-pin fan engineered for ultra-quiet, high-performance cooling. Featuring dual-speed control (4500/3700 RPM), advanced acoustic optimization, and over 150,000 hours mean time to failure, it’s the ideal upgrade for compact devices like 3D printers, NAS, and routers. Complete with anti-vibration mounts and versatile connectors, it delivers reliable, whisper-quiet airflow with professional-grade durability.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Meters Per Hour
Best Sellers Rank	#40 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Customer Reviews	4.8 4.8 out of 5 stars (11,233)
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 Grams
Manufacturer	Noctua
Material Type	Fibre-glass reinforced PBT
Maximum Rotational Speed	4500 RPM
Model	NF-A4x10
Noise Level	17.9 Decibels
Number of Items	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	1.0 Count
Voltage	12 Volts
Warranty Description	6 year manufacturer’s warranty

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