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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Description

🌀 Silence Meets Power: The Ultimate Mini Fan Upgrade

COMPACT POWERHOUSE - Ultra-compact 40x40x10 mm size fits seamlessly into tight spaces like 3D printers, NAS, and network devices without compromise.
WHISPER QUIET COOLING - Experience near-silent airflow with advanced acoustic optimization, perfect for focused workspaces and tech setups.
PRECISION SPEED CONTROL - Dual-speed operation at 4500 or 3700 RPM via included Low-Noise Adaptors lets you customize airflow vs. silence effortlessly.
VIBRATION FREE OPERATION - Anti-vibration mounts and premium build materials ensure stable, noise-free performance that won’t disrupt your environment.
ALL INCLUSIVE INSTALLATION KIT - Comes with fan screws, extension cable, OmniJoin adaptor, and Low-Noise Adaptors for hassle-free, versatile connectivity.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V 3-pin fan designed for ultra-quiet, high-performance cooling. With speeds up to 4500 RPM and noise levels as low as 17.9 dB(A), it offers customizable airflow via Low-Noise Adaptors. Built for longevity with over 150,000 hours MTTF and equipped with anti-vibration mounts, it’s the ideal replacement fan for compact devices like 3D printers, NAS, and routers.

Specifications

Product Dimensions	1.57"L x 0.39"W x 1.57"H
Brand	Noctua
Power Connector Type	3-Pin
Voltage	12 Volts
Cooling Method	Air
Compatible Devices	Desktop
Noise Level	17.9 Decibels
Material	Fibre-glass reinforced PBT
Maximum Rotational Speed	4500 RPM
Air Flow Capacity	60.1 Cubic Meters Per Hour
UPC	163121136772 809185325669 806291857176 804066543873 842431014054 102930672934 782386476753 172302657890 132017920719 808111662861 809385174852 168141421648 851905102548
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Manufacturer	Noctua
Number of Items	1
Series	NF-A4x10 FLX
Item model number	NF-A4x10
Item Weight	1.76 ounces
Item Dimensions LxWxH	1.57 x 1.57 x 0.39 inches
Color	Brown
ASIN	B009NQLT0M
Is Discontinued By Manufacturer	No
Date First Available	October 9, 2012

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