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 40x40x10mm 3-pin 4500 RPM Case Fan/Case Cooler | High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin

Noctua NF-A4X10 FLX 40x40x10mm 3-pin 4500 RPM Case Fan/Case Cooler | High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin

Product ID: 77270766

Details

Brand
Noctua
Cooling Method
Fan
Power Connector Type
3-Pin
Product Dimensions
40L x 10W x
Voltage
12 Volts

💨8.2 m³/h airflow

🔇17.9 dB ultra-quiet

⚙️4500 RPM max speed

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Description

💨 Powerfully compact, silently efficient — your PC’s new best friend.

SLIM YET MIGHTY - 10mm slim design fits tight spaces without compromising airflow.
ADVANCED AERODYNAMICS - Flow Acceleration Channels boost airflow efficiency and reduce noise.
WHISPER QUIET COOLING - Operates at a barely-there 17.9 dB for distraction-free productivity.
DUAL SPEED FLEXIBILITY - Choose between 4500 or 3700 RPM to balance performance and noise.
VIBRATION FREE OPERATION - Integrated anti-vibration pads ensure silent, stable cooling.

The Noctua NF-A4X10 FLX is a premium 40x40x10mm 3-pin case fan designed for high airflow and low noise. Featuring a slim 10mm profile, dual-speed settings (4500/3700 RPM), and advanced Flow Acceleration Channels, it delivers efficient cooling with minimal sound (17.9 dB). Its compact motor hub maximizes blade surface area for superior performance, while integrated anti-vibration pads ensure quiet, stable operation. Perfect for tight PC builds and electronics cooling, backed by a 6-year manufacturer warranty.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Meters Per Hour
Best Sellers Rank	#96,326 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #508 in Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.8 4.8 out of 5 stars (11,167)
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
Number of Packs	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
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

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