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)

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

Product ID: 260040000

Details

Brand
Noctua
Cooling method
Fan
Power connector type
3-Pin
Product dimensions
40L x 40W x
Voltage
12 Volts

⚡4500 RPM max speed

🌀60.1 m³/h airflow

🔇17.9 dB(A) ultra-quiet

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Description

🛠️ Upgrade your gear, silence your space.

BUILT TO LAST - Over 150,000 hours MTTF ensures your cooling solution stays reliable through countless projects and long workdays.
COMPACT POWERHOUSE - Ultra-slim 40x40x10 mm design fits perfectly in tight spaces like 3D printers, NAS, and network devices without compromise.
WHISPER QUIET COOLING - Experience near-silent operation with industry-leading 17.9 dB(A) noise levels—your workspace’s new zen zone.
VIBRATION FREE OPERATION - Includes anti-vibration mounts and OmniJoin adaptor set for seamless, rattle-free installation and compatibility.
PRECISION AIRFLOW CONTROL - Dual-speed 4500/3700 RPM with Low-Noise Adaptors lets you fine-tune performance for maximum airflow or stealth mode.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V 3-pin fan engineered for ultra-quiet, high-performance cooling. With a max speed of 4500 RPM and airflow of 60.1 m³/h, it delivers efficient cooling at just 17.9 dB(A). Designed for compact devices like 3D printers and NAS units, it includes vibration mounts and multiple adaptors for versatile, silent operation and boasts an impressive 150,000+ hour lifespan.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	60.1 Cubic Meters Per Hour
Best Sellers Rank	#30,366 in Computers ( See Top 100 in Computers ) #224 in Computer Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.8 4.8 out of 5 stars (10,986)
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Included Components	1 package
Item Dimensions L x W x H	40L x 40W x 10H millimeters
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 Count
Voltage	12 Volts

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