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 CPU compatibility list and 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 CPU compatibility list and 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
Video Reviews
The following video reviews have not been created by Noctua. Responsibility for the information and views expressed in the videos lies entirely with the authors.
16.01.2018 // DDWorld.cz

NH-L9a-AM4 Review

NOCTUA L9A AM4 představuje maximální kompaktnost. Není sice výkonově a hlučností lepší než BOX Wraith SPIRE chladič, který dnes AMD používá, ale je ještě menší, a hlavně 2x nižší, což se může někomu hodit. I když i v malých skříních je obvykle místa dost i na těch 85mm, co má stále poměrně nízký Wraith Spire. L9a-AM4 je v podstatě extrémní řešení, kde jde o co nejmenší rozměry při solidním výkonu i nízké hlučnosti a maximálně kvalitním zpracování. Za to prostě platíte. NOCTUA L12S pak představuje velmi výkonné a velmi kompaktní řešení, kde když můžete, tak s ventilátorem zespodu a 70mm na výšku je skvělým chladičem do ITX sestav. Samozřejmě při špičkovém zpracování a nízké hlučnosti. Cena pak není vůbec špatná a celkově je to jeden z nejzajímavějších klasických nízko-profilových chladičů na trhu.
Test verdict: "Cena pak není vůbec špatná a celkově je to jeden z nejzajímavějších klasických nízko-profilových chladičů na trhu. Ocenění tedy zasloužené." (Jan Stach, DDWorld.cz)
08.01.2018 // TheLab.gr

NH-L9a-AM4 Review

Η Noctua συνδυάζοντας την τεχνολογία των απλών ψυκτρών με αυτήν των heat pipes, μας δίνει μια ψύκτρα με εντυπωσιακές επιδόσεις, ικανή να κρατήσει το επεξεργαστή μας ασφαλή ακόμα και κάτω από παράλογα υψηλά -για το μέγεθός της- θερμικά φορτία! Εκμεταλλευόμενη την "άνεση" που τις δίνει το ΑMD AM4 footprint, εξασφαλίζει πλήρη συμβατότητα με το πέριξ του socket, hardware και χάρη στο μικρό ύψος της, που είναι παραπλήσιο με αυτό των μνημών, μπορεί να τοποθετηθεί ακόμα και στα μικρότερα κουτιά HTPC. Στον σπουδαίο ανεμιστήρα που την συνοδεύει, πέρα από την εξαιρετική θερμοαπαγωγική ικανότητα, οφείλει πολλά και στο θέμα του θορύβου, του οποίου το επίπεδο, κυμαινόμενο από το τελείως αθόρυβο, έως το απαλλαγμένο από ενοχλητικές συχνότητες διακριτικό "φύσημα", καθιστά την NH-L9a AM4 πρώτη επιλογή για οποιοδήποτε σύστημα compact HTPC βασίζεται στους νέους AMD Ryzen5. Παρά την "για λόγους αρχής" συντηρητική θέση της κατασκευάστριας όσον αφορά στο TDP της, σε ένα ευάερο κουτί θα σας εκπλήξει με την ευκολία που αντιμετωπίζει αρκετά μεγαλύτερα φορτία, επιτρέποντας στο μικροσκοπικό υπολογιστή σας, να ανταπεξέλθει σε ότι του ζητηθεί, από το να είναι multimedia center, μέχρι παιχνιδομηχανή. Η ποιότητα κατασκευής της είναι κορυφαία και το δοκιμασμένο σύστημα στήριξης κάνει την εγκατάσταση της. . . "παιχνίδι" ! Το μόνο που θα θέλαμε να είναι καλύτερο, είναι το κόστος της και αυτό όχι γιατί δεν ανακλά αυτά που προσφέρει, αλλά γιατί θα θέλαμε να είναι πιο προσιτή στους χρήστες.
Test verdict: "Αν έχετε ένα διακριτικό HTPC και ψάχνετε για την καλύτερη ψύξη του Ryzen5 επεξεργαστή σας, αλλά δεν είστε διατεθειμένοι ούτε να παραιτηθείτε από τις άλλες "ανησυχίες" σας, αλλά ούτε να χάσετε την ησυχία σας, δύσκολα θα βρείτε αυτά που προσφέρει η Noctua NH-L9a AM4 και σε τόσο μικρό μέγεθος! " (Stelios Petousakis, TheLab.gr)
17.11.2017 // PureOverclock.com

NH-L9a-AM4 Review

I have to say that I was pleasantly surprised with the performance of both these coolers. Even though the NH-L9a-AM4 was unable to tame a 3.7 GHz overclock, I did not expect it to be able to hold it at all. The fact that it didn’t immediately throttle – it took over three minutes – was pretty epic. The NH-L12S did fare a lot better, and was able to keep the chip cool in both the stock and OC circumstances. Both coolers represent Noctua at their finest. I’ve never known a fan or cooler from Noctua to be underwhelming in terms of performance or their overall design. As we all know, their color scheme is one which you’ll either love or you’ll hate, but I do value them as a company for sticking to their roots and letting the performance speak for itself. Anyhow, both coolers are perfectly capable of styling up your rig whilst making minimal noise. Both the NH-L12S and NH-L9a-AM4 remained next to whisper quiet throughout the testing that I put them through, even under 100% load.
Test verdict: "As always, Noctua offers and excellent option for cooling, especially in the SFF market." (Brendan van Varik, PureOverclock.com)
10.11.2017 // FunkyKit.com

NH-L9a-AM4 Review

Noctua NH-L9a-AM4 is a cooler designed for all who want to build small PC and for that it’s perfect. There are not many competitive products on the market so it’s hard to compare it to anything else. The NH-L9a-AM4 performs great considering its small size but at the same time is not making noise, even though fan has to spin faster than on the larger coolers. Noctua new fans are offering perfect balance between high performance and low noise. I’m not saying you won’t hear it when CPU will be under load but generated sound is not loud what you could expect from a cooler this size. Noctua NH-L9a-AM4 is covered by 6-year warranty. It’s the best warranty on the CPU cooler market. It also proves high quality of the product as Noctua is not afraid to offer so long warranty.
Test verdict: "If you are looking for a small cooler for your Ryzen box then Noctua NH-L9a is clearly one of the most interesting options. It’s hard to find any competitive cooler which offers as much in so small package." (Bartosz Waluk, FunkyKit.com)
31.10.2017 // PC Ekspert

NH-L9a-AM4 Review

Oba Noctuina hladnjaka imaju vrlo specifičnu namjenu, a to je hladiti AM4 procesore u manjim, skučenijim kućištima. Pred njih smo u ovom testu stavili najteži zadatak, hladiti Ryzena 7 1800X u čemu su oni i uspjeli. To znači kako će u kućištima niskog profila bez problema hladiti Ryzene 3 ili 5 za koje ju jasno i puno prikladniji. U push-pull konfiguraciji će L12S čak ohladiti i overclockirani Ryzen procesor što je vrlo dobro, jer ostavlja prostora i entuzijastima. I dok je manjem L9a hladnjaku teško naći manu, L12S ju ima. Unatoč različitim načinima orijentacije unutar kućišta, uvijek će prvi DIMM slot biti prekriven i onemogućen za korištenje, pa je to nešto na što treba dobro pripaziti prilikom nabavke. Ako nemamo namjeru koristiti prvi DIMM do socketa, tada problema neće biti.
Test verdict: "Oba su hladnjaka vrlo kvalitetno napravljena, oba imaju sve što je potrebno za instalaciju i korištenje i oba su zadovoljavajuće tiha u radu." (Krešimir Matanović, PC Ekspert)
24.10.2017 // GinjFo.com

NH-L9a-AM4 Review

Ce NH-L9a-AM4 s’adresse aux configurations AMD à petit facteur de forme. Compatible avec l’AM4, ce ventirad propose des performances de bonnes tenues tout en préservant le silence. Il dispose de dimensions et d’une hauteur limitées ce qui lui permet de prendre place dans des espaces réduits. Proposé à 39,90 €, il profite d’un bundle assez riche et d’une garantie de 6 ans.
Test verdict: "A nos yeux, sa place dans un HTPC est conseillée sachant que le silence est très souvent un critère de choix." (Jérôme Gianoli, GinjFo.com)
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)
16.01.2018 // Neoseeker.com

NH-L9a-AM4 Review

Noctua has again made its mark on the computer after-market peripheral upgrades. Although the NH-L9a-AM4 L-Type low-profile cooler is specific to the new AMD Ryzen socket, the NH-L12S contains the mounting hardware for all of the current Intel and AMD socket types; plus Noctua offers a free upgrade for future socket designs. Noctua only requires a proof of purchase (photo, scan or screenshot of the invoice) of both a Noctua CPU cooler and hardware components corresponding to the specific kit when requesting a mounting kit upgrade.
Test verdict: "As previously stated, the NH-L9a AM4 & NH-L12S coolers are neither designed nor recommended for an overclocked setup. What they do provide is efficient cooling performance for compact/small form factor cases, and they can be an ideal fit for new systems based on AMD Ryzen APUs." (Marvin Purdy, Neoseeker.com)
15.01.2018 // Obzorium.com

NH-L9a-AM4 Review

Каждая модель, выпущенная Noctua, доказывает, что австрийским специалистам нет равных в деле воздушного охлаждения. С новинкой Noctua NH-L9a-AM4 так же — кулер отлично справляется с многоядерным AMD Ryzen 1700, а значит на младших моделях будет чувствовать себя еще лучше. Рекомендуем данный кулер для использования в настольных системах дома или в офисе, но углубляться в оверклокинг не советуем. Плюсуйте сюда низкую цену и выбор становится более чем очевиден.
Test verdict: "Открыв коробку вы поймете, что между словом премиум и Noctua можно смело ставить знак равенства" (Natalya Scherbakova, Obzorium.com)
13.12.2017 // hardwareinside.de

NH-L9a-AM4 Review

Was die Lautstärke betrifft, schenken die beiden sich nicht viel. Auffällig ist, dass beide Lüfter sich erst ab ca. 50 % ihrer maximalen Drehzahl von der Raumlautstärke abheben. Das sind bei dem NH-L12S 1080 U/min und bei dem NH-L9a-AM4 sogar 1550 U/min. Lüfter von anderen Herstellern sind bei dieser Drehzahl in der Regel deutlich zu hören.
Test verdict: "Noctua steht für Qualität und das zeigen diese beiden Kühler. Die Verarbeitung ist von der Verpackung bis hin zur kleinsten Schraube absolut erste Klasse. Ein cleveres Konzept sorgt für einen einfachen Einbau der Kühler." (Robin Wibberg, hardwareinside.de)


  • Compact, highly flexible controller for 4-pin PWM fans


  • 4-Pin Extension Cables

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

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.

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.

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.

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

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.

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.

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.

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.

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.

Do you have a question concerning one of our products? Please use this form to pose a question!