Review: Noctua NH-L9a-AM4 Low Profile CPU-Kühler 92mm [NH-L9a-AM4]

The Noctua NH-L9a-AM4 Low Profile cooler CPU-Kühler 92mm is just 37 mm of total height, which is ideal for thin HTPC and small form factor (SFF) cases. It has a compact size for 100% compatibility with RAM and PCIe on ITX motherboards, and also does not interfere with access to the connectors near the processor socket. Noctua uses a quiet premium-class fan NF-A9x14 with an adapter that provides low noise and with the possibility of automatic speed control using PWM. The Noctua NH-L9a-AM4 Low Profile CPU-Kühler 92mm is also the award-winning NT-H1 thermal paste and easy-to-install mounting system SecuFirm2TM for AM4 processor and AMD APU connectors from AMD. Trusted Noctua quality is backed up with a 6-year manufacturer’s warranty.

You can buy Noctua NH-L9a-AM4 Low Profile CPU-Kühler 92mm for the price 42,99 Don’t forget to use discount coupon on computeruniverse.netFWNNROU (How to use it?).


  • Gaming: yes
  • For Socket processor AM4
  • Type: CPU cooler
  • AMD: AM4
  • 1 fan 92x92x25 mm
  • Maximum power dissipation, W 65
  • Number of heat pipes 2
  • Radiator material: aluminum + copper
  • Rotational speed: 300 – 2500 rpm
  • Airflow: 24.01 – 33.84 CFM
  • Noise level: 14.8 – 23.6 dB
  • Bearing Type: NCB
  • Connector Type: 4-pin PWM
  • Backlight: none
  • Speed controller: internal
  • Uptime: 150000 hours
  • Dimensions of the cooler (WxHxD): 114x37x92 mm
  • Weight: 465 g.
  • Weight with packaging on computeruniverse: 0,7kg

Comparition table

Comparition table
Cooler NH-L9a-AM4 NH-L9i
LGA2066 X X
LGA2011-0 & LGA2011-3 X X
LGA115x (LGA1150, LGA1151, LGA1155, LGA1156) X
LGA1366 X X
LGA775 X X
AM2(+), AM3(+), FM1, FM2 (+) X X
AM4 with NM-AM4-L9aL9i
TR4 & SP3 X X

Scope of delivery

  • NF-A9x14 PWM premium fan
  • Low-Noise Adaptor (L.N.A.)
  • NT-H1 high-grade thermal compound
  • SecuFirm2 AM4 mounting kit
  • Screws for 92x92x25mm fans
  • Noctua metal case-badge


The NH-L9a-AM4 is the latest, AM4-specific revision of Noctua’s award-winning NH-L9a low-profile CPU cooler for AMD Ryzen-based HTPCs and Small Form Factor (SFF) systems. At a height of only 37mm, the NH-L9a is ideal for extremely slim cases and, due to its small footprint, it provides 100% RAM and PCIe compatibility as well as easy access to near-socket connectors even on tightly packed mini-ITX motherboards. The custom-designed SecuFirm2™ mounting system for the AM4 socket makes installation child’s play and, thanks to the highly optimised NF-A9x14 92mm fan that supports fully automatic speed control via PWM, the NH-L9a-AM4 runs remarkably quietly. Topped off with Noctua’s renowned NT-H1 thermal compound, the NH-L9a-AM4 combines everything users have come to expect from Noctua’s larger coolers into a super-compact, premium-quality package for ITX and HTPC builds with Ryzen CPUs or APUs.

Main Features

  • Only 37mm total height, ideal for slim HTPC cases and Small Form Factor (SFF) builds
  • Compact footprint for 100% RAM and PCIe compatibility on ITX motherboards as well as easy access to near-socket connectors
  • Quiet, premium-grade NF-A9x14 fan with Low-Noise Adaptor and automatic speed control via PWM
  • Includes award-winning NT-H1 thermal compound and easy-to-install SecuFirm2TM mounting system for the AM4 socket of AMD’s Ryzen CPUs and APUs
  • Trusted Noctua quality backed up with 6-year manufacturer’s warranty

New revision for Ryzen’s AM4 socket

Since the original NH-L9a for AM2(+), AM3(+), FM1 and FM2(+) has received more than 50 awards and recommendations from international hardware websites and magazines, the new AM4 revision builds on the same proven heatsink design to provide excellent low-profile cooling performance for Ryzen CPUs and APUs.

37mm low profile

Due to the slim 23mm heatsink and the NF-A9x14 low profile fan that measures only 14mm in thickness, the NH-L9 stands a mere 37mm tall, which makes it ideal for use in compact HTPCs or Small Form Factor cases that offer minimum clearance for CPU coolers.

100% RAM compatibility

The NH-L9a-AM4 has a compact footprint that fully complies with the socket keep-out zones specified by AMD. This means that neither the heatsink nor the fan overhang the RAM, so the cooler provides easy access to the slots and is fully compatible with tall memory modules.

100% compatibility with PCIe cards on mini-ITX

Some AMD-based mini-ITX motherboards have the PCIe slot located close to the CPU socket zone. While larger coolers that exceed this zone may block the PCIe slot, the compact-sized NH-L9a-AM4 provides full compatibility with PCIe cards.

Easy access to near-socket connectors

Many low-profile coolers use larger fans or heatsinks in order to achieve sufficient performance, but by protruding over the socket zone, they make it difficult or even impossible to reach near-socket connectors on tightly packed ITX motherboards. Thanks to its compact footprint, the NH-L9a-AM4 provides easy access to all connectors and components.

NF-A9x14 PWM premium fan

The highly optimised, award-winning NF-A9x14 premium fan features Noctua’s proprietary AAO frame as well as sophisticated aerodynamic design measures. Supporting PWM for fully automatic speed control, the NF-A9x14 allows the NH-L9a-AM4 to stay remarkably quiet.

Low-Noise Adaptor

Allowing the maximum speed of the NF-A9x14 PWM fan to be reduced from 2500 to 1800rpm, the included Low-Noise Adaptor (LNA) makes it possible to achieve near-silent setups using CPUs with less than 65W TDP.

Custom-designed SecuFirm2™ mounting for AM4

The NH-L9a-AM4 comes with a custom-designed SecuFirm2™ mounting system for the AM4 socket of AMD’s Ryzen platform. Allowing the heatsink to be fixed from the back of the motherboard, it makes installation easier than ever, all while maintaining the trusted SecuFirm2™ quality.

NT-H1 thermal compound

Noctua’s much-acclaimed NT-H1 is a pro-grade TIM solution that provides minimum thermal resistance, excellent ease of use and outstanding reliability. Chosen again and again by overclockers and enthusiast users worldwide, it has established itself as a benchmark for premium-quality thermal compounds.

Customer Reviews

Buyers were completely satisfied with the small dimensions of the cooler and low noise. Users noted the excellent optimization of the cooling system for AMD Ryzen processors of the new generation, with which the units from AMD operate at quite acceptable temperatures, and the fan itself behaves almost silently.

According to customer reviews, the Noctua NH-L9a-AM4 Low Profile CPU-Kühler 92mm is an excellent option for cases such as the Node 202, Asrock Deskmini A300, where it is not always possible to insert a AMD box cooler.

Installation height is up to 6 cm and really cools, copes with the task of cooling processors up to 40-50 tdp.

Summing up the reviews, we can say that the Noctua NH-L9a-AM4 Low Profile CPU-Kühler 92mm is a top-end cooler with an installation height limit of 5-6 cm and just a salvation for anyone who wants to assemble a PC in the mITX package.

Not good for my setup
February 17, 2019 [Verified Purchase]

Got this along with a ryzen 5 2600 and ASRock Fatal1ty AB350 Gaming-ITX/ac in a Fractal Design Node 202 over black Friday to use as a small home theater build.

The NH-L9a ended up being worse thermally (but quieter) than the Wraith Stealth cooler included with the 2600, despite several heatsink remounts, and making sure the area around the fan is clear of wires.

I narrowed the cause to on this motherboard due to CPU socket orientation, half of the find are blocked by the ram, a set of G.Skill TridentZ in this build, so airflow suffered, and had to undervolt the 2600 considerably to keep it under 90c load temps.

After switching back to the Wraith cooler, the CPU dropped 10-15 degrees Celsius under load at stock settings, and while slightly louder I feel safer having it at those temperatures for extended periods.

Customer feedback from Amazon from buyer did not fit the cooler.


Virtually Silent and Perfect for a Mini-ITX HTPC Ryzen 3 Build
April 9, 2018 [Verified Purchase]

This fan is virtually silent. My HTPC with a Ryzen 3 2200G cannot be heard unless you stick your ear against the case. This HTPC is in my bedroom 4 feet from my bed and I sleep in complete silence and have never been able to hear it, even when trying to. Keeps temps in the high 20s C at idle and low to mid 30s C while watching movies on a 4K screen. I used the included low noise adapter which cuts the rpms somewhat and still have seen great performance. No case fans or anything on my build, just this guy keeping my Ryzen silently happy. Just

In other words if you want a silent cooler for a HTPC this along with it’s low noise adapter are perfect and should fit inside just about any HTPC case. It has plenty of clearance in my silverstone 6b mini-ITX case, installation was a breeze, nothing out of the ordinary.

Customer review from Amazon

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