Noctua NH-D9 TR5-SP6 4U CPU Cooler sTR5/SP6 Server CPU Cooler

This Noctua NH-D9 TR5-SP6 4U is a server air cooler for CPU, specifically designed for sTR5 and SP6 sockets. It is designed for 4U chassis, maintaining a relatively compact height of 134 mm, without sacrificing the massive heatsink and dual fans. The dual tower with a copper base and heat pipes, plus aluminum fins, is aimed at stable cooling under prolonged load. In typical Noctua style, there is no RGB, and the focus is on reliability and controllable noise – up to 30.6 dBA.

What you get

You get a dual heatsink with a copper base and copper heat pipes, combined with aluminum cooling fins – a classic, effective design for server loads. The two 92 x 92 x 25 mm NF-A9 HS-PWM fans operate in the range 400–2500 RPM, giving you enough headroom to balance between noise and cooling according to the system profile. With a declared airflow of 192.6 m³/h, the cooler is prepared for densely loaded 24/7 server environments where airflow is critical. The 4-pin PWM control allows precise management through the motherboard, and the included splitter PWM connector makes it easy to connect both fans to one header. The pre-applied thermal paste NT-H2 saves time during initial installation and minimizes the risk of incorrect application.

• Air cooling with a dual heatsink and copper base, optimized for heavily loaded server CPUs on sTR5 and SP6 sockets.
• Two included 92 x 92 x 25 mm NF-A9 HS-PWM fans provide stable airflow and even cooling across the entire heatsink.
• Wide speed range 400–2500 RPM allows for quiet idle mode and aggressive cooling under full load.
• Airflow up to 192.6 m³/h helps effectively dissipate heat even in densely packed 4U server cases.
• Noise level up to 30.6 dBA is a reasonable compromise for a server environment where stable temperatures are a priority.
• Compact dimensions 95 x 120 x 134 mm and height 134 mm, compatible with 4U rack chassis and taller components around.
• Premium build: copper base and heat pipes, aluminum fins, included SecuFirm2™ mounting kit and NM-SMT3 tool for easier installation.
• Pre-applied thermal paste NT-H2 saves time and ensures consistent contact from the first installation.
• Long warranty of 72 months provides peace of mind for long-term 24/7 operation.

Who it is suitable for

This cooler is for server and workstation configurations based on sTR5/SP6, which operate in 4U racks and require stable temperatures under constant load. It is suitable if you are looking for a reliable air solution without RGB and unnecessary effects, focused on durability and easy maintenance. It is not a good choice if you are aiming for ultra-low-profile cooling for 1U/2U or if you require completely silent operation in a quiet office environment.

The combination of a dual heatsink, two PWM fans, a copper base, and the long 6-year warranty makes the NH-D9 TR5-SP6 4U a very sensible choice for serious sTR5/SP6 server systems where cooling should not be a compromise.