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.

  Caution:  The NH-L9i is a highly-compact low-profile quiet 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 should be used with care on CPUs with more than 65W TDP (Thermal Design Power). Please consult our TDP guidelines to find out whether the NH-L9i is recommended for your CPU.
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-L9i has a 95x95mm footprint that complies exactly to the Intel LGA115x socket keep-out zone. This means that it won't cause issues with chipset coolers and doesn't overhang the RAM slots, so it's fully compatible with tall memory modules.
100% compatibility with PCIe cards on mini-ITX

100% compatibility with PCIe cards on mini-ITX

Most Intel LGA115x based mini-ITX mainboards have the PCIe slot sitting right next to the 95x95mm socket zone. While larger coolers that exceed this zone are likely to block the PCIe slot, the 95x95xmm sized NH-L9i provides full compatibility with PCIe cards.
NF-A9x14 PWM premium fan

NF-A9x14 PWM premium fan

The highly optimised 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-L9i to stay remarkably quiet.
Low-Noise Adaptor

Low-Noise Adaptor

Allowing to reduce the maximum speed of the NF-A9x14 fan from 2500 to 1800rpm, the included (L.N.A.) makes it possible to achieve near-silent setups using CPUs with less than 65W TDP.
Custom-designed SecuFirm2™ mounting for LGA115x

Custom-designed SecuFirm2™ mounting for LGA115x

The NH-L9i bundles a custom-designed, backplate-less SecuFirm2™ mounting system for LGA115x that offers extended compatibility with mini-ITX boards and 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.
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-L9i package comes with a full 6-year manufacturer's warranty.
Cooler Specification
LGA1150, LGA1151, LGA1155, LGA1156
Height (without 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/s)
420 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™ 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)
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.
06.03.2017 // Glob3trotters.com

NH-L9i Review

Even though the C7 has a bigger heatsink, the fan is not as good as the Noctua’s and this clearly shows and on the auto profile fan curve when it looses to the Noctua in the games tests. But while it ramps up at the cost of very high noise, the C7 is slightly better performing than the Noctua. The Noctua is a great performer overall and has the quieter fan, minus the max % where all coolers are noisy.
Test verdict: "The Noctua NH-L9i takes the crown for now for the best overall all-arounder very low profile cooler." (Glob3trotters.com)
04.12.2016 // PCGH Extreme Forum

NH-L9i Review

Im Vergleich zum C7 ist der Noctua NH-L9i meiner Meinung nach der bessere Kühler. Er hat durch seine kompaktere Bauweise eine höhere Kompatibilität und er ist im Betrieb deutlich leiser. Doch das Hauptargument für mich ist der wechselbare Lüfter. Nachdem der Test vorbei war, hatte ich wieder meinen C7 montiert und ich war von ihm plötzlich enttäuscht. Das Geräuschniveau das Noctuas ist schon mit dem Standard Lüfter deutlich geringer. Montiert man einen 25mm Lüfter, wird das System selbst unter Last angenehm leise, während der C7 störend wirkt.
Test verdict: "Der Noctua NH-L9i zeigt eine bemerkenswert Kühlleistung für seine kompakte Bauweise." (Marco Kloos, PCGH Extreme Forum)
05.11.2016 // tinysilentpc.se

NH-L9i Review

This is close to a perfect very low profile cooler, except the performance for medium to higher TDP processors is lacking. For an office PC, light to medium gaming PC, or a slim HTPC solution this cooler could be a great choice. Installation is effortless and very quick.
Test verdict: "Noctua NH-L9i is a premium, easy product, that is very quiet for its intended TDP use of 65W." (Robert Andersson, tinysilentpc.se)
18.10.2016 // ITNdaily.ru

NH-L9i Review

Забавно, что в нашем случае система охлаждения оказалась дороже тестового процессора, что не характерно для платформы Intel, однако вполне нормально для премиальных кулеров Noctua, которые являются одними из самых дорогих СО на рынке.
Test verdict: "Рекомендуем Noctua NH-L9i современным пользователям, которые ищут тихий и компактный кулер для миниатюрной домашней системы (поклонников такого формата с каждым становится все больше)." (Евгений Никифоров, ITNdaily.ru)
11.08.2016 // PCReviews.es

NH-L9i Review

Uno de los aspectos a tener en cuenta es que Noctua especifica en su pagina web que el Noctua NH-L9i y el NH-L9a están diseñados para CPUs de hasta 65W de potencia térmica, aunque en caso de utilizar uno de mayor potencia tampoco pasa nada, aunque no tiene mucha lógica debido a que para este fin tenemos disipadores mejores e incluso más baratos. Para realizar la prueba se ha empleado un procesador 3770K que no es ni remotamente el idóneo pero ha aguantado de forma correcta los 77W. Aunque una vez lo probamos es imposible perder lo de vista, ya que la gran virtud de este disipador es que con 37 mm existen pocos disipadores con un perfil menor que este en el mercado y aun menos con la capacidad de que se encuentren diseñados para un consumo moderado y potencias térmicas limitadas. Las pruebas realizadas en idle y en full dejan un buen resultado, ademas hay que destacar su sonoridad, ya que apenas se escucha el disipador.
Test verdict: "Sin duda alguna los disipadores Noctua NH-L9i y NH-L9a son una opción recomendable para todos aquellos usuarios que quieran disponer de equipos pequeños a un sonido bajo, el punto negativo a estos disipadores es el precio ya que se encuentran con un precio aproximado de 50€ cada uno, pero aun así no deja de ser un precio adecuado para unos disipadores de una gran calidad." (Sergi Sanz, PCReviews.es)
10.08.2016 // FunkyKit.com

NH-L9i Review

Noctua NH-L9i is high quality and well performing compact cooler. As I mentioned at the beginning of this review, not many similar coolers are available on the market and for sure not many can offer so high product quality. Everything looks great including package.
Test verdict: "If you are looking for a compact cooler which can replace Intel reference solution but offers better quality, design and performance then Noctua NH-L9i is a product for you. It’s hard to find many other coolers which are as good for small builds and HTPC so of course NH-L9i deserves our recommendation!" (Bartosz Waluk, FunkyKit.com)
11.07.2016 // Tecnogeekies.com/

NH-L9i Review

Sin embargo una vez más no hemos de perder de vista la gran virtud de este disipador, y es que con 37mm pocos disipadores con un perfil menor que este podremos encontrar y menos aún que estén diseñados para procesadores que no estén diseñados específicamente para un consumo moderado y potencias térmicas limitadas.
Test verdict: Pequeño con unas prestaciones optimas para equipos de procesadores de gama media o baja, este chiquitín nos ofrece una solución para las cajas más pequeñas del mercado reduciendo por casi el doble de altura a los disipadores de stock. Aparte de los silencioso que es se portó como un campeón aguantando toda la potencia del i7 4790k en las pruebas a 4,2 ghz los 8 hilos. Por ello, este dispositivo recibe el Galardón de Oro de TecnoGeekies.
18.05.2016 // AndroidPC.es

NH-L9i Review

Después de probar los modelos Noctua NH-L9i y Noctua NH-L9a hemos podido comprobar otra vez como esta marca sigue en su línea de calidad, los acabados y materiales son excelentes. El rendimiento térmico está en la línea de lo exigido a un producto así que como es lógico no está diseñado para realizar OC del procesador. En cuanto al nivel de sonoridad como hemos podido comprobar casi son imperceptibles en un uso normal y molestan muy poco cuando se les exige algo más.
Test verdict: "Un modelo que se merece nuestro sello de producto recomendado ya que seguro que no defrauda a quien busque este tamaño de disipador para su caja." (Joaquin Prida Trujillo, AndroidPC.es)
29.04.2016 // goldfries.com

NH-L9i Review

Amazing! Based on what I see, it could be possible for the NH-L9i to run fanless on 50W TDP processors. What’s neat about the NH-L9i is that the bundled fan is reasonably silent, it reaches only 2500 RPM on full and it’s not noisy enough to drown other components so it’s barely audible once it’s in a casing.
Test verdict: "The Noctua NH-L9i Low-Profile CPU Cooler retails at RM 185, whether you’re running a compact setup like HTPC or a desktop, this CPU cooler is compact and does the job well for everything except to tame overclocked processors." (Brian Chon, goldfries.com)
19.04.2016 // Allround-PC.com

NH-L9i Review

Noctua gibt für den NH-L9i eine TDP von 65 Watt an. Je nach Prozessor-Generation können jedoch auch Prozessoren mit einer höheren TDP gekühlt werden. Laut Noctua bietet der NH-L9i genügend Kühlleistung, um Intel Skylake-Prozessoren mit einer TDP von 95 Watt zu kühlen, was jedoch eine gute Gehäusebelüftung voraussetzt. Zudem sollte von Overclocking abgesehen werden, da die Temperaturwerte sonst zu stark ansteigen könnten. Wir haben den Kühler in Kombination mit dem Intel Core i7-6700K getestet. Dazu wurden alle Kerne des Prozessors mit dem Programm CPU Burn-in ausgelastet und der Temperaturverlauf aufgezeichnet und der Höchstwert ermittelt. [...] Dieser lag beim Noctua NH-L9i bei 74 Grad Celsius. Im Leerlauf wurde der Prozessor auf 32 °C heruntergekühlt. Die Geräuschentwicklung hält sich selbst unter Volllast in Grenzen und ist uns nicht unangenehm aufgefallen. Die TDP liegt beim NH-L9x65 bei 84 Watt, kann je nach Prozessor jedoch auch höher ausfallen. Laut Noctua sind Skylake-CPUs mit einer TDP von 95 Watt kein Problem, vorausgesetzt das Gehäuse ist ausreichend gut belüftet. Dementsprechend kam auch der NH-L9x65 mit unserem Core i7-6700K zurecht und erreicht etwas bessere Werte als sein kleiner Bruder, was angesichts der dickeren Bauhöhe sowie der zusätzlichen Heatpipes zu erwarten war. Im Idle sind es 28 Grad und unter Volllast werden maximal 65 °C erreicht. Da der Lüfter identisch ist, sind von der Lautstärke her nahezu keine Unterschiede auszumachen.
Test verdict: "Beide getesteten Low-Profile-Kühler sind sehr gut verarbeitet und lassen sich mit wenig Aufwand montieren. Die Kühlleistung ist gut, wobei der NH-L9x65 dank seiner zusätzlichen Heatpipes und dickeren Bauhöhe erwartungsgemäß etwas besser abschneidet. Bei leistungsstarken Prozessoren sollte jedoch auf eine ausreichende Gehäuselüftung geachtet werden. Zudem sollte von Übertaktungsversuchen abgesehen werden, da die Kühler sonst sehr schnell an ihr Limit kommen. Positiv hervorzuheben ist der angenehm leise Lautstärkepegel der Lüfter." (Niklas Ludwig, Allround-PC.com)

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

Is the NH-L9i compatible with the Gigabyte GA-H77N-WIFI and GA-Z77N-WIFI?

Yes, after a slight revision, the NH-L9i is now fully compatible with these mainboards.

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.

My unlocked Intel CPU is running too hot although my heatsink supports the specified TDP, what's the problem?

Intel's unlocked CPUs (K, X and C suffix) can dissipate more heat than indicated by the TDP specification if
  1. the TDP limits are extended or disabled in the motherboards' BIOS.
  2. the motherboard applies automatic overclocking by default, e.g. by raising the supply voltage of the CPU and using higher Turbo-Mode multipliers.
  3. some software creates untypical loads, e.g. Prime95 with AVX2 support and a) and/or b) apply.

This can lead to temperature issues, especially when using smaller coolers or compact cases.

The actual power draw of the processor can be monitored with software provided by the motherboard vendor or with 3rd party tools like HWInfo or HWMonitor.

If you encounter temperature issues (>90°C) and notice a higher than specified power draw, please ensure that no automatic overclocking is applied and limit the TDP to the specified value by choosing appropriate BIOS settings.

For Kaby Lake CPUs, it may also help to lower the CPU clock speed for applications that heavily use the AVX instruction set, which can lead to higher loads and power draw. This option is usually referred to as “AVX offset” and makes it possible to lower the multiplier specifically for AVX based applications without reducing performance when using other instruction sets. Depending on the quality of the CPU and the programs being used, a reduction of 2-3 steps usually gives very good results.

Please contact your motherboard vendor for details if you have trouble finding the appropriate settings in the BIOS.

All our TDP recommendations are based on thorough testing with the default values specified by Intel using popular applications such as Asus Realbench and prime95. Please note, however, that prime95 creates a particularly high load that goes beyond typical application scenarios and this leads to elevated temperatures. We thus recommend using other programs such as Realbench for checking the stability and temperatures of the CPU in realistic scenarios.

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