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Noctua NH-L9x65 Review


Noctua NH-L9x65 Conclusion:

The coolers I have tested from Noctua have so far been made for the high thermal loads you see with overclocking. They are by nature massive and capable of moving large volumes of air, and of course they stand out on any motherboard. While large coolers are impressive and fun to show off, for small form factor builds you need a cooler that can get the job done in a small space. And that is just what the NH-L9x65 does. The engineering that went into the entire package for the NH-L9x65 is remarkable, from literally the box and internal packaging, to the installation hardware, cooler, and fan. But if you have ever used a Noctua cooler (and I mean this as a compliment), this is just another day at the office.

The low profile NH-L9x65 is small and compact. With this cooler, Noctua is targeting the Small Form Factor and HTPC builders who want a dependable, capable cooler that can fit in the small chunk of real estate usually found in these systems. The NH-L9x65 is a revised, performance-enhanced version of the NH-L9 low-profile cooler. Improvements include an increase in fin stack height, which translates to a change from 37mm to 65mm, and two additional heat pipes. Noctua’s famous SecuFirm2™ mounting systems are well known for quality and safety, as well as ease of use, and make the installation process quick and easy. Large coolers can block or partially block access to fan headers and RAM slots, but the NH-L9x65 provides 100% RAM and PCIe compatibility on Intel-based ITX mainboards - not many coolers can brag about that. You can use the tallest RAM available and still access all of your fan headers.

As far as performance goes, things got a little toasty in my testing, which was expected. But my testing is really outside the boundaries of what this cooler would normally be subjected. My testing did show that this little cooler that can almost fit in the palm of your hand still kept an overclocked 4770K a few degrees below 100 °C. While that is a bit on the high side, I hesitate to list the cooling performance as a Con, because if you use the cooler within the design intention, which is small form factor cases and HTPC environments, then you will have no problems. It does a fine job of cooling. If you try to cool an overclocked gaming system, well, Noctua has a variety of coolers that are better choices.

Noctua has you covered for any size cooler you may need.  Are you looking to build a small system based on an ITX motherboard? With a six-year warranty, the NH-L9x65 retails for $59.99 and would be right at home in your HTPC build.



  • Good cooling performance
  • Memory compatibility (no blocked slots)
  • PCIe compatibility on Intel-based ITX mainboards
  • Low noise
  • SecuFirm2™ mounting system
  • Vibration dampening
  • Solid build quality
  • Six-year warranty



  • None


OCC Silver

  1. Noctua NH-L9x65: Introduction & Closer Look
  2. Noctua NH-L9x65: Closer Look (Continued)
  3. Noctua NH-L9x65: Specifications & Features
  4. Noctua NH-L9x65: Testing Setup & Results
  5. Noctua NH-L9x65: Conclusion
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