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

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

What you get

You get a dual radiator with copper base and copper heat-pipes, combined with aluminum cooling fins – a classic, efficient design for server loads. The two 92 x 92 x 25 mm NF-A9 HS-PWM fans operate in a 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 via the motherboard, and the included splitter PWM connector facilitates connecting both fans to a single header. The pre-applied NT-H2 thermal paste saves time during initial installation and minimizes the risk of improper application.

• Air cooling with a dual radiator and copper base, optimized for high-load 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 of the entire radiator.
• A 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 the priority.
• Compact dimensions 95 x 120 x 134 mm and height 134 mm, compatible with 4U rack chassis and taller components nearby.
• Premium build: copper base and heat-pipes, aluminum fins, included SecuFirm2™ mounting kit and NM-SMT3 tool for easier installation.
• Pre-applied NT-H2 thermal paste saves time and ensures consistent contact from the first installation.
• A long warranty of 72 months provides peace of mind for long-term 24/7 operation.

Who is it suitable for

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

The combination of a dual radiator, 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.