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: 735272421

Details

ブランド
Noctua
冷却方法
空気
商品の寸法
40長さ x 40幅 x
対応デバイス
デスクトップ
最大回転速度
4500 毎分回転数
材質
ファイバーグラス強化PBT

🌀4500 RPM max speed

🔇17.9 dB(A) ultra-quiet

⚙️150,000h MTTF durability

₪117

Duties & taxes included

In stock

Sold byAmazon IsraelDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Elevate your cooling game with silent precision — because your gear deserves the best.

WHISPER QUIET POWER - Experience premium airflow with noise levels as low as 17.9 dB(A), perfect for focused workspaces and serene environments.
ADVANCED AERODYNAMICS - Noctua’s Flow Acceleration Channels and AAO frame optimize airflow and reduce turbulence for superior thermal management.
DUAL SPEED FLEXIBILITY - Adjust between 4500 and 3700 RPM using the included low-noise adapter to balance maximum cooling or silent operation on demand.
PLUG PLAY VERSATILITY - Comes with modular cables, anti-vibration mounts, and OmniJoin adapters ensuring easy installation and compatibility across devices.
COMPACT PRECISION COOLING - Sized at a sleek 40x40x10 mm, this fan fits seamlessly into tight setups like 3D printers, NAS, and routers without compromising performance.

The Noctua NF-A4x10 FLX is a premium 40x40x10 mm 12V 3-pin fan engineered for ultra-quiet operation at up to 4500 RPM with a noise level capped at 17.9 dB(A). Featuring advanced aerodynamic design and durable SSO2 bearings, it offers exceptional airflow and longevity (MTTF >150,000 hours). Ideal for compact electronics like 3D printers, NAS, and routers, it includes versatile accessories such as low-noise adapters and OmniJoin connectors, backed by a 6-year manufacturer warranty.

Specifications

ASIN	B009NQLT0M
Amazon 売れ筋ランキング	産業・研究開発用品 - 52,412位 ( 産業・研究開発用品の売れ筋ランキングを見る ) 冷却ファン - 301位
GTIN (Global Trade Identification Number)	04716123314691, 07123290462549, 07133363436841
UPC	163121136772 809185325669 806291857176 804066543873 842431014054 102930672934 782386476753 172302657890 132017920719 808111662861 809385174852 168141421648 851905102548
おすすめ度	4.8 5つ星のうち4.8 (11,047) var
ブランド名	Noctua
メーカー名	Noctua
メーカー型番	NF-A4x10
モデル番号	NF-A4x10
ユニット数	1.0 個
冷却方法	空気
品目寸法（L x W x H）	40長さ x 40幅 x 10高さ mm
商品の重量	50 グラム
対応アイテム	デスクトップ
最大回転速度	4500 毎分回転数
空気流量	8.2 立方メートル/時
素材	ファイバーグラス強化PBT
電圧（ボルト）	12 ボルト
電源コネクタタイプ	3ピン
騒音レベル	17.9 デシベル

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