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

💨 Silent power in a compact frame — cool smarter, not louder!

DURABLE PRECISION - SSO2 bearing and reduced motor hub size ensure long-lasting reliability
COMPACT POWERHOUSE - Slim 40x40x10mm design fits tight spaces without compromise
WHISPER QUIET COOLING - Advanced Flow Acceleration Channels reduce noise and boost efficiency
FLEXIBLE SPEED CONTROL - Dual-speed settings (4500/3700 RPM) for tailored cooling needs
VIBRATION FREE OPERATION - Integrated anti-vibration pads for silent, stable performance

The Noctua NF-A4X10 FLX is a premium 40x40x10mm 3-pin case fan delivering up to 8.2 m³/h airflow at a whisper-quiet 17.9 dB noise level. Featuring Flow Acceleration Channels and a compact motor hub, it maximizes cooling efficiency in tight PC builds. With dual-speed control, anti-vibration pads, and a durable SSO2 bearing, it offers flexible, reliable, and silent cooling backed by a 6-year warranty.

Specifications

ASIN	B009NQLT0M
Air Flow Capacity	8.2 Cubic Meters Per Hour
Best Sellers Rank	#21,923 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #93 in Case Fans
Brand Name	Noctua
Compatible Devices	Desktop
Cooling Method	Fan
Customer Reviews	4.8 4.8 out of 5 stars (11,188)
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 Highlight	High Airflow Low Noise 10mm Slim Design, for PC and Electronics Cooling, 2 Speed Settings 4500/3700rpm 3-Pin
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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