Is this a 3 pin or 4 pin fan?

It is a 4 pin fan, however; it could be connected to 3 pin but it will run at full speed, according to the manual

Does this fan come with a retension clip to attach to a nh-u9s?

No it does not but the nh-u9s comes with two sets of retention clips, two for each fan.

Is this NF-A9 PWM delivered with a Y-adapter for two fan hookup?

Yes It is complete with a Y csble, an extension cable and a speed reducer. It is packed in a quality box like expensive watches with formed padding.

Is it possible to wire with 2 wires, a hot and a ground?

yes. You need to connect 12V + Ground http://noctua.at/en/products/cpu-cooler-retail.html?faq_view=72

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💻 Cool your rig, not your vibe — silent power in every spin!

WHISPER QUIET POWER - Experience premium cooling with just 22.8 dB noise—stay focused without distractions.
DURABLE SSO 2 BEARING - Self-stabilizing oil bearing ensures long-lasting, reliable performance for your high-demand desktop.
PRECISION PWM CONTROL - 4-pin PWM connector enables dynamic speed adjustment from 400 to 2000 RPM for tailored cooling.
OPTIMIZED AIRFLOW DYNAMICS - 78.9 m³/h airflow with Flow Acceleration Channels for superior heat dissipation.
ADVANCED ACOUSTIC OPTIMIZATION - AAO frame design minimizes vibrations and noise, perfect for sleek, silent setups.

The Noctua NF-A9 PWM is a 92mm premium desktop cooling fan featuring advanced SSO2 bearing technology, Flow Acceleration Channels, and an AAO frame for optimized airflow and acoustic performance. Operating quietly at 22.8 dB(A) with a max speed of 2000 RPM, it offers precise PWM control for efficient, customizable cooling. Designed for professionals who demand silent, reliable performance in their desktop systems.

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Brand	Noctua
Power Connector Type	4-Pin
Voltage	12 Volts
Cooling Method	Fan
Compatible Devices	Desktop
Noise Level	22.8 dB
Maximum Rotational Speed	2000 RPM
UPC	842431014481 731215275791
Global Trade Identification Number	04139052263135, 04716123315513
Manufacturer	Noctua, Noctua
Number of Items	1
Series	NF-A9 PWM
Colour	Brown
Item Height	3.62 Inches
Item Width	0.98 Inches
Product Dimensions	9.19 x 2.49 x 9.19 cm; 226.8 g
Item model number	NF-A9 PWM
Are Batteries Included	No
Manufacturer	Noctua
Country of Origin	USA
Item Weight	227 g

Noctua NF-A9 PWM, 4-Pin Premium Cooling Fan for Desktop (92mm, Brown)

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