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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🌀 Elevate your airflow game with whisper-quiet precision cooling!

BUILT TO LAST - Over 150,000 hours mean-time-to-failure ensures your system stays cool and reliable through countless work sessions.
DYNAMIC PWM CONTROL - Smart 4-pin PWM allows seamless speed adjustments for optimal cooling and energy efficiency on demand.
PRECISION 92 MM DESIGN - Compact yet powerful, perfectly engineered for small form factor builds and high-efficiency CPU coolers.
WHISPER QUIET COOLING - Experience near-silent operation with advanced acoustic optimization—keep your workspace zen without sacrificing performance.
VERSATILE COMPATIBILITY - Ideal for HTPCs, NAS devices, and compact PC cases—upgrade your airflow without compromise.

The Noctua NF-A9 PWM is a premium 92x25mm quiet fan featuring advanced acoustic optimization and Flow Acceleration Channels. Operating at up to 2000 RPM with a max noise level of 22.8 dB(A), it delivers efficient cooling for compact PC builds and specialized devices. With a robust 4-pin PWM interface and an exceptional lifespan exceeding 150,000 hours, it’s engineered for professionals demanding silent, reliable performance.

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€ 68.69

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Brand	Noctua
Product Dimensions	9.19 x 2.49 x 9.19 cm; 226.8 g
Item model number	NF-A9 PWM
Manufacturer	NOCTUA
Series	NF-A9 PWM
Color	Brown
Voltage	12 Volts
Operating System	Windows
Are Batteries Included	No
Item Weight	227 g

Noctua NF-A9 PWM, Premium Quiet Fan, 4-Pin (92mm, Brown)

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