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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NF-A4x10 FLX

Product ID: 50475471

Details

Air flow capacity
8.2 Cubic Per
Brand
Noctua
Compatible devices
Desktop
Cooling method
Air
Material
Fibre-glass
Maximum rotational speed
4500 RPM

🔇Ultra-quiet max 17.9 dB(A)

🌬️4500/3700 RPM dual-speed airflow

🛠️>150,000 h MTTF durability

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Description

🌟 Stay cool, stay ahead—quiet power in a slim package!

SLIM 40 X 10 MM DESIGN - Fits seamlessly into tight spaces like 3D printers, NAS, and compact electronics for sleek, efficient cooling.
WHISPER QUIET POWER - Experience premium airflow without the noise—perfect for focused work or peaceful home setups.
DUAL SPEED FLEXIBILITY - Switch effortlessly between 4500 RPM for max airflow or 3700 RPM for near-silent operation with included Low-Noise Adaptors.
PLUG PLAY VERSATILITY - Comes with extension cables and OmniJoin adaptors for easy integration with proprietary fan headers—no hassle, just cool.
VIBRATION FREE OPERATION - Anti-vibration mounts ensure stable, noiseless performance, elevating your device’s longevity and your peace of mind.

The Noctua NF-A4x10 FLX is a high-performance 40x40x10mm fan engineered for ultra-quiet, efficient cooling. Featuring dual-speed settings (4500/3700 RPM), advanced aerodynamic design, and anti-vibration mounts, it’s ideal for replacing noisy 12V 4cm fans in compact electronics like 3D printers, NAS, and routers. With a max noise level of just 17.9 dB(A) and an impressive >150,000 hours MTTF, it delivers reliable, whisper-quiet airflow backed by a 6-year warranty.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Metres Per Hour
Best Sellers Rank	15,978 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 185 in Thermal Management Products
Brand	Noctua
Compatible Devices	Desktop
Cooling Method	Air
Country Of Origin	China
Customer Reviews	4.8 4.8 out of 5 stars (11,305)
Global Trade Identification Number	04716123314691, 07123290462549, 07133363436841
Included Components	Please see product Description for what is included
Item Dimensions L x W x H	40L x 40W x 10H millimetres
Item Highlight	High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin
Item Weight	50 Grams
Manufacturer	Noctua
Manufacturer Part Number	NF-A4x10
Material	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
Power Connector Type	3-Pin
Product Warranty	6 year manufacturer’s warranty
UPC	163121136772 809185325669 806291857176 804066543873 842431014054 102930672934 782386476753 172302657890 132017920719 808111662861 809385174852 168141421648 851905102548
Unit Count	1.0 count
Voltage	12 Volts

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R777

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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