Noctua NH-L9i Low Profile Cooler Review


With more consumers making tiny and efficient home theater PCs the primary delivery system for enjoying media in their living room, there is a rising need for compact and quiet CPU coolers. The Noctua NH-L9i has been designed specifically with the mini-ITX form factor in mind. While the majority of gamers continue to fill the voids of their chassis with cooling units exceeding 160mm in height, what could one expect to get from a 37mm unit like this one? As the NH-L9i demonstrates, pairing a highly efficient and whisper quiet fan with a slim heatsink can yield respectable cooling figures for even a full-size gaming PC.



The NH-L9i is a premium quality quiet CPU cooler for Intel LGA115x based HTPCs and Small Form Factor systems. At a super-low profile of only 37mm, the NH-L9i is ideal for extremely slim cases and due to its 95x95mm footprint, it provides full compatibility with tall RAM modules and VGA cards on mini-ITX mainboards. The custom designed SecuFirm2™ mounting system for LGA115x makes installation a child’s play and thanks to the highly optimised NF-A9x14 premium fan that supports fully automatic speed control via PWM, the NH-L9i runs remarkably quiet. Topped off with Noctua’s renowned NT-H1 thermal compound, the NH-L9i fuses everything users have come to expect from Noctua’s larger coolers into a super-compact package for slim HTPC systems.

  • 37mm low profile
  • 100% RAM compatibility
  • 100% compatibility with PCIe cards on mini-ITX
  • NF-A9x14 PWM premium fan
  • Low-Noise Adaptor
  • Custom-designed SecuFirm2™ mounting for LGA115x
  • NT-H1 thermal compound
  • 6 years manufacturer’s warranty


*Courtesy of Noctua




Cooler Specifications

Socket Compatibility

LGA1150, LGA1155, LGA1156

Height (withoout fan) 23 mm
Width (without fan) 95 mm 
Depth (without fan) 95 mm 
Height (with fan) 37 mm    
Width (with fan) 95 mm
Depth (with fan) 95 mm
Weight (without fan) 345 g
Weight (with fan) 420 g   
Material Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating
Fan Compatibility 92x92x14mm, 92x92x25mm
Scope of Delivery
  • NF-A9x14 PWM premium fan
  • Low-Noise Adaptor (L.N.A.)
  • NT-H1 high-grade thermal compound
  • SecuFirm2™ Mounting Kit
  • Screws for 92x92x25mm fans
  • Noctua Metal Case-Badge
Warranty 6 Years
Fan Specifications
Model Noctua NF-A9x14 PWM
Bearing SSO2
Max Rotational Speed (+/- 10%) 2500 RPM
Max Rotational Speed with L.N.A. (+/- 10%) 1800 RPM
Min Rotational Speed (PWM) 300 RPM
Max Airflow

57,5 m³/h

Max Airflow with L.N.A. 40,8 m³/h
Max Acoustical Noise 23,6 dB(A)
Max Acoustical Noise with L.N.A.  14,8 dB(A)
Input Power 2,52 W
Voltage Range  12 V
MTBF  > 150,000 h

*Courtesy of Noctua



The box containg the NH-L9i comes sporting Noctua's signature white and brown colors. Product info and specifications are listed on the sides, while a more detailed description of the cooler is printed on the backside in multiple languages. Inside we find the cooler itself, a syringe of Noctua's NT-H1 thermal compound, a low-noise fan adapter cable, four socket mount screws, four spare fan mount screws, instructiions, and a Noctua badge to be affixed to your case if you so desire.


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