Koeler Noctua NH-D9DX i4 3U

The Noctua NH-D9DX i4 3U is a compact, dual-tower CPU cooler designed for Intel Xeon platforms with LGA2011 (Square and Narrow ILM), LGA1356 and LGA1366 sockets. With a 95×95 mm footprint and a reduced height of 110 mm, the cooler is fully 3U compliant while clearing RAM slots on supported platforms. It ships with an NF-A9 PWM 92 mm fan, the SecuFirm2™ professional mounting system and Noctua's NT-H1 thermal compound to form a complete cooling solution for workstations and servers.

Advantages

The NH-D9DX i4 combines a dual-tower heatsink with the NF-A9 PWM fan to deliver improved quiet cooling performance in a compact 3U-compatible form factor. Its 95×95 mm base avoids interference with memory modules, ensuring full RAM compatibility even with tall heatspreaders. The included SecuFirm2™ mounting guarantees correct contact pressure on supported Xeon sockets, and the bundled NT-H1 thermal paste offers proven low thermal resistance and reliable application. The NF-A9 fan supports PWM automatic control and can be run at reduced top speed using the supplied Low-Noise Adaptor for lower acoustics. The package also supports a second optional fan for increased cooling capacity.

Suitable for

• 3U servers and rackmount workstations where height is limited
• Quiet Xeon-based systems for audio, video processing or scientific workstations
• Systems requiring full RAM access and compatibility with tall memory heatspreaders

Key specifications

• Model: Noctua NH-D9DX i4 3U
• Footprint: 95 × 95 mm
• Height: 110 mm (3U compatible)
• Fan: NF-A9 PWM, 92 mm; speed 400–2000 RPM; Low-Noise Adaptor reduces max to 1550 RPM
• Airflow: 78.9 m³/h (manufacturer specification for NF-A9)
• Bearing: Self‑Stabilising Oil‑pressure Bearing (SSO)
• Supported sockets: LGA2011 (Square & Narrow ILM), LGA1356, LGA1366, LGA2011-v3
• Colour: silver
• Included accessories: SecuFirm2™ mounting, NT-H1 thermal compound, fan clips for optional second fan, y-cable
• Weight: 0.531 kg
• Warranty: 6 years manufacturer’s warranty

How to use

Install the SecuFirm2™ mounting brackets onto the target socket following the supplied instructions for your specific Intel Xeon platform. Apply a small, even amount of the included NT-H1 thermal compound to the CPU heatspreader. Seat the heatsink onto the CPU and fasten it with the SecuFirm2™ screws to achieve correct contact pressure. Connect the NF-A9 PWM fan to the CPU fan header on the motherboard for automatic speed control. If lower noise is required, attach the supplied Low-Noise Adaptor to reduce the maximum fan speed. To increase cooling capacity, mount an optional second NF-A9 fan to the front fin stack using the included clips and connect both fans with the supplied y-cable to one header.

Recommendations

Use the NH-D9DX i4 in 3U enclosures and workstations where clearance above memory modules is critical. Ensure the motherboard BIOS or system software supports PWM fan control for automatic speed regulation; if acoustic priority is required, fit the Low-Noise Adaptor or run a second fan at reduced speed for improved thermal performance with minimal noise increase.