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

Noctua Nf A4x10 Flx 40x40x10mm 3 Pin 4500 Rpm Case

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Description

💨 Cool your rig, not your vibe — silent power in a compact frame!

COMPACT POWERHOUSE - Smaller motor hub means more blade surface for superior cooling
FLEXIBLE COMPATIBILITY - 3-pin with 3-to-2 pin adaptor & polarity protection for easy setup
TAILORED NOISE CONTROL - Includes Low-Noise Adaptor for customizable fan speed
WHISPER QUIET OPERATION - SSO2 bearing + anti-vibration pads ensure silent performance
PRECISION AIRFLOW ENGINEERING - Flow Acceleration Channels boost efficiency & reduce noise

The Noctua NF-A4X10 FLX is a premium 40x40x10mm case fan delivering 8.2 m³/h airflow at a whisper-quiet 17.9 dB noise level. Featuring advanced Flow Acceleration Channels and a compact motor hub, it maximizes cooling efficiency while minimizing sound. With a max speed of 4500 RPM, anti-vibration pads, and flexible 3-pin connectivity, it’s engineered for seamless, silent performance in tight spaces.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Meters Per Hour
Best Sellers Rank	#49,113 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #245 in Case Fans
Brand	Noctua
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.8 out of 5 stars 10,984 Reviews
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Importer Contact Information	Acro Engineering Company, Z-41, Sanjay Colony II, Pocket Y, Sanjay Colony, Okhla Phase II, Okhla Industrial Estate, New Delhi, Delhi 110020
Included Components	Case Fan
Item Dimensions L x W x H	40L x 10W x 40H Millimeters
Item Type Name	Case Fan
Item Weight	50 Grams
Manufacturer	Noctua, Rascom Computerdistribution Ges.m.b.H. Huttengasse 71-75 A-1160 Wien Austria
Manufacturer Contact Information	Rascom Computerdistribution Ges.m.b.H. Huttengasse 71-75 A-1160 Wien Austria
Material Type	Fibre-glass reinforced PBT
Max Rotational Speed	4500 RPM
Model Number	NF-A4x10
Noise Level	17.9 Decibels
Number of Items	1
Packer Contact Information	Rascom Computerdistribution Ges.m.b.H. Huttengasse 71-75 A-1160 Wien Austria
Part Number	NF-A4x10
Power Connector Type	3-Pin
Product Dimensions	40L x 10W x 40H Millimeters
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

Reviews

T**R

1.04.2025

P**R

1.04.2019

V**M

17.07.2022

H**S

20.11.2021

J**S

15.05.2024

K**T

10.12.2024

J**O

11.03.2026

J**E

11.12.2013

W**Y

2.05.2026

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