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.
The NH-L9a-AM4 is a highly compact, quiet low-profile cooler designed for use in small form factor cases and HTPC environments. While it provides first-rate performance in its class, it is not suitable for overclocking and is only recommended for CPUs/APUs with up to 95W TDP (Thermal Design Power). Please consult our TDP guidelines to find out whether the NH-L9a-AM4 is recommended for your CPU/APU.
New revision for Ryzen’s AM4 socket

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

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

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

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

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

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

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

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

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.
6-year manufacturer’s warranty

6-year manufacturer’s warranty

Noctua products are renowned for their impeccable quality and outstanding longevity. Like all Noctua fans, the supplied NF-A9x14 features an MTTF rating of more than 150.000 hours and the entire NH-L9a package comes with a full 6-year manufacturer's warranty.
Notes and warnings
The NH-L9a-AM4 is a highly compact, quiet low-profile cooler designed for use in small form factor cases and HTPC environments. While it provides first-rate performance in its class, it is not suitable for overclocking and is only recommended for CPUs/APUs with up to 95W TDP (Thermal Design Power). Please consult our TDP guidelines to find out whether the NH-L9a-AM4 is recommended for your CPU/APU.
Cooler Specification
Height (without fan)
23 mm
Width (without fan)
114 mm
Depth (without fan)
92 mm
Height (with fan)
37 mm
Width (with fan)
114 mm
Depth (with fan)
92 mm
Weight (without fan)
390 g
Weight (with fan/s)
465 g
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating
Max. TDP
see TDP guide
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™ AM4 mounting kit
  • Screws for 92x92x25mm fans
  • Noctua metal case-badge
6 Years
FAN Specification
Noctua NF-A9x14 PWM
Max. Rotational Speed (+/- 10%)
2500 RPM
Max. Rotational Speed with L.N.A. (+/- 10%)
1800 RPM
Min. Rotational Speed (PWM, +/-20%)
600 RPM
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
> 150.000 h
NH-L9i & NH-L9a
15.10.2017 // RealHardTechX.com

NH-L9a-AM4 Review

El NOCTUA NH-L9a-AM4 es un soberbio disipador para entornos HTPC. Su enorme calidad impresiona. El equipo de ingenieros de la marca austríaca ha logrado adecuar con éxito el diseño ofrecido por el ya excelente NH-L9a a la nueva plataforma AM4. El grado de excelencia alcanzado por Noctua no deja de maravillarnos y nos hace esperar con impaciencia su siguiente innovación. Destacar la inclusión de el excelente ventilador Noctua NF-A9x14 PWM. Con él, Noctua consiguen maximizar el rendimiento sin comprometer por ello lo que para la marca es su santo y seña, que no es otra cosa que el funcionamiento silencioso. El montaje no puede ser más sencillo. El sistema de montaje multisocket SecuFirm2 para AM4 acompañado por unas completas y claras instrucciones hace que el proceso sea un juego de niños independientemente del nivel que se tenga.
Test verdict: "En definitiva, el maravilloso NOCTUa NH-L9a-AM4 es un refrigerador premium diseñado para satisfacer a los más exigentes." (José Romero, RealHardTechX.com)
11.10.2017 // GreenTechReviews.ru

NH-L9a-AM4 Review

Что ж, результаты нас очень впечатлили! Даже при максимальной работе вентилятора, которую мы выставили вручную, систему было очень слабо слышно. А при автоматическом управлении скоростью, вентилятор было вообще не слышно даже практически в упор.
Test verdict: "Процессорный кулер Noctua NH-L9a-AM4 является бескомпромиссным решением для сборки очень компактной системы даже с флагманским процессором. Кулер проявил себя исключительно с лучших сторон — он демонстрирует впечатляющую эффективность при своих скромных размеров, а также характерен практически бесшумной работой." Владимир Солонин, GreenTechReviews.ru)
08.10.2017 // XtremeSystems.org

NH-L9a-AM4 Review

The NH-L9a-AM4 continues with the excellent built quality and a quiet operation that we have come to love and expected from Noctua. Make no mistake, the NH-L9a-AM4 is not meant for extreme overclockers. Its low profile design and small foot-print is meant to be used in slim profile PC and HTPC systems. It is designed for compact systems that need decent cooling performance and low operational noise level. From a performance outlook, we were pleasantly surprised from its performance in such a small form factor. While Noctua didn’t recommended any overclocking with this cooler we feel that it has the capacity to handle a decent mild overclock.
Test verdict: "In addition to the performance and near silence, the NH-L9a-AM4 was extremely easy to install." (Ambrosidou Nat, XtremeSystems.org)
06.10.2017 // HWready.it

NH-L9a-AM4 Review

Il piccolo L9 si comporta alla grande e si candida per essere il più piccolo dei dissipatori per socket AM4. Nonostante le dimensioni i risultati ottenuti sono molto buoni e il dissipatore riesce a rimanere silenzioso. NH-L12S: Questo è un dissipatore completo che riesce senza molti problemi anche a reggere il nostro test in overclock. Una grande compatibilità con quasi tutti i socket lo rendono sicuramente un acquisto molto appetibile per la longevità.
Test verdict: "I due dissipatori si comportano entrambi molto bene, L12 permette anche un considerevole overclock, quindi un ottima scelta per chi vuole dilettarsi in questa pratica. Per quanto riguarda il piccolo L9 invece è un ottima alternativa per PC molto compatti garantendo dissipazione migliore del dissipatore stock originale." (Mauro Santoro, HWready.it)
06.10.2017 // Razorman.net

NH-L9a-AM4 Review

Medimos en IDLE una temperatura mínima de 31.8ºC tras 10 minutos de tener encendido el equipo, llegando a una temperatura máxima de 37.7ºC en el minuto 12 de la prueba. La temperatura es realmente muy buena para tratarse de un cooler tan pequeño y que mantiene a raya a todo un Ryzen 7 1700 con un TDP de 65W. En cuanto a sonoridad, sólo podemos alabar el buen funcionamiento del ventilador, que ni a máximas revoluciones es molesto, recordemos que tan sólo produce 23.6 dB(A).
Test verdict: "El cooler Noctua NH-L9A-AM4 es ideal para nuestro HTPC de salón, pues sus diminutas dimensiones son ideales para equipos de estas características. Nos ha gustado su bajísima sonoridad en cualquier circunstancia – pudiendo rebajarla aún más utilizando el cable ULNA – y la facilidad de instalación, pues es sólo preciso colocar el backplate trasero y asegurarlo con 4 tornillos." (Jose Luis Fernandez, Razorman.net)
04.10.2017 // PCnet.com.tr

NH-L9a-AM4 Review

95 Watt TDP sınırı olan soğutucunun overclock ve daha üst TDP’ler durumunda yetersiz olacağı ortada ama zaten bu derece kompakt boyutlarına bakarsak daha fazlasını beklemek mantıklı olmazdı. Sıcaklık değerleri 70C üstüne çıkıyor ama bu sadece aralıksız olarak 12 komut işlettiğinizde geçerli ve tehlike söz konusu değil. Kasanızda soğutma kötüyse daha da yükselebilir.
Test verdict: "AMD Ryzen işlemcinizi dar bir kasada kullanmak ve tamamen sessiz biçimde soğutmak istiyorsanız temin edebileceğiniz en iyi işlemci soğutucularından biri." (Gorkem Yildirim, PCnet.com.tr)

Installation Manual (PDF)

Information Sheet (PDF)

The mounting brackets don’t touch the mainboard, is this an issue?

No. The mounting brackets are not meant to touch the mainboard and the flexibility of the brackets is required to create the appropriate contact pressure. There should be up to 3mm (Intel) or 4mm (AMD) space between the mainboard and the mounting brackets when the cooler is correctly installed.

nh-l9 mounting bar spacing

How should I clean my Noctua cooler?

Dust: Fans and heatsinks inside computer cases tend to accumulate dust over longer periods of usage. In order to maintain maximum performance, please clean your fan and heatsink regularly. For cleaning, please first remove the fan from the heatsink and clean it using a duster, slightly moist tissue or canned air. Please be careful not to use too much force in order to prevent any damage to the fan. Please do not use a vacuum cleaner as this may apply excessive force to the fan and do not put the fan under running water as water residues inside the motor may lead to short circuits. Please also note that the fan is not designed to be taken apart by the user. Removing the impeller from the frame will break the sealing of the bearing and results in a loss of warranty. Before reinstalling the fan, clean the heatsink itself with a duster or vacuum cleaner. Do not use water to clean the cooler. Finally put the fan back on and connect it to your motherboard fan header or fan controller.
Thermal paste residues: Whenever you take off the heatsink from the CPU, we recommend to clean the CPU as well as the base of the cooler before re-applying thermal paste and re-installing the cooler. You can either just wipe the base and the CPU clean with a dry, lint-free tissue or, for more thorough cleaning, use a lint-free tissue moistened with either a mild solution of washing-up liquid or isopropyl alcohol. Do not put the cooler or CPU under running water. Note that both the base of the heatsink and the CPU should be dry, free from residues of thermal compound and free from grease before re-applying thermal paste and re-installing the cooler.

What Thermal Design Power (TDP) is this cooler recommended for and how much Watt (W) of heat can it dissipate?

Please refer to our TDP guide for information on maximum recommended TDP and heat dissipation.

My case supports CPU coolers of up to XXXmm height, which model should I choose?

Please refer to our TDP guide in order to select the cooler that offers the best cooling performance at a given height.

I have difficulties installing the cooler, can you help?

Please refer to the installation manual and our video installation guides for detailed instructions on how to install the cooler.

How much torque should be applied when tightening the screws of a Noctua CPU cooler?

All screws should be tightened gently until they stop without using excessive force. Please do not exceed the following values for maximum tightening torque:
Screw typeMax. torque
NM-SSC1 screws for fixing the fastening brackets to the base of the heatsink0.5 Nm
NM-ITS1 thumb screws for fixing Intel mounting bars0.5 Nm
NM-ALS1 screws for fixing AMD mounting bars0.6 Nm
Spring-loaded screws for fixing the heatsink to the mounting bars0.6 Nm

How can I determine if the motherboard’s UEFI BIOS is overclocking my processor by default and deactivate this automatic overclocking?

Most motherboard vendors allow their overclocking-enabled products (e.g. those with Intels X- or Z-series chipsets) to run the processor at increased clock speeds by default, without requiring any user action at all. Since TDP (Thermal Design Power) limits are usually also disabled by default, this leads to the CPU exceeding the rated TDP to a varying degree, depending on the used applications and their workloads. Due to the increased heat output of the CPU, you may see higher CPU temperatures than expected.

In order to find out if your motherboard is overclocking your processor by default, please enter the UEFI BIOS and select the “advanced” or “overclocking” menu. There you should be able to find options such as “MultiCore Enhancement” (options: enabled/disabled), “CPU Ratio Apply Mode” (options: all/per core) or similar. To disable the automatic overclocking, adjust the settings either to “disabled” or “per core” and make sure that the individual multipliers match the original specifications.

In doubt, please contact your motherboard vendor for detailed instructions on how to disable this feature.

Can I install a Noctua cooler in my system from Acer, Dell, HP or Lenovo?

Systems from Acer, Apple, Dell, HP, Lenovo or other major brands often use motherboards which differ slightly from the specifications issued by Intel and AMD. While those changes are usually subtle, they can lead to compatibility issues with coolers that were built to comply with these specifications.

Even in case the cooler is mechanically compatible and can be installed, other issues can occur, e.g. proprietary fan connectors, BIOS errors due to a low fan speed, shutdowns, etc. Some of these problems can be avoided with some technical knowledge, but especially BIOS related issues can often not be resolved.

Due to the large number of possible issues that cannot be resolved with different mounting parts alone, Noctua does not officially support systems from Acer, Apple, Dell, HP, Lenovo or other major brands.

Can I upgrade my existing Noctua cooler to socket TR4 or SP3?

Unfortunately, it is not possible to upgrade existing Noctua heatsinks to support the AMD TR4 and SP3 sockets for Ryzen Threadripper (X399) and Epyc CPUs. TR4/SP3 CPUs have much bigger heatspreaders (as compared to e.g. LGA2066 or AM4 processors) and the contact surfaces of standard Noctua heatsinks would cover only about half of these heatspreaders, which would result in insufficient cooling performance. On top of that, the heatpipes of bigger cooler models like the NH-D15 or NH-D15S would completely block the RAM slots on many TR4/SP3 motherboards. For this reason, Noctua has introduced the new NH-U14S TR4-SP3, NH-U12S TR4-SP3 and NH-U9 TR4-SP3 cooler models that feature bigger contact surfaces and have been tailored to fit TR4 and SP3 systems. Please choose these models for AMD Ryzen Threadripper and Epyc systems.

Which Noctua fan or CPU cooler should I buy? How to choose the right model?

Not sure which Noctua product to buy? Our detailed buying guides for fans and CPU coolers help you to choose the model that works best for you.

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