Product discontinued. Successor model: NH-U9B SE2

The NH-U9B continues the legacy of Noctua's classic NH-U coolers, which won over 150 awards and recommendations from leading international websites and magazines. Due to its compact size, the NH-U9B is perfect for HTPCs and small cases as well all as other applications that don't provide sufficient space for its bigger brother NH-U12P. Bundled with Noctua's award-winning NT-H1 thermal compound and fitted with the new NF-B9 fan, the NH-U9B offers outstanding quietness and excellent performance levels close to the NH-U12P.
4 dual heat pipes

4 dual heat pipes

4 dual heat pipes, excellently soldered joints and widely-spaced cooling fins ensure optimal heat dissipation even at low fan speeds.
Award winning NH-U design

Award winning NH-U design

Noctua's NH-U coolers allow for perfect airflow direction and have received more than 150 awards and recommendations from leading international websites and magazines.
NF-B9 premium fan

NF-B9 premium fan

Boasting exceptionally high airflow and pressure performance, the NF-B9 is ideally suited for CPU cooling. Bevelled blade tips, Vortex-Control Notches as well as Noctua's SCD drive system and premium-grade SSO-Bearing guarantee outstanding quietness and long-term stability.
High compatibility

High compatibility

Thanks to its compact size, the NH-U9B provides excellent compatibility with small cases, HTPC systems and other components.
SecuFirm™ multi-socket mounting system

SecuFirm™ multi-socket mounting system

Noctua's professional SecuFirm™ mounting system for LGA 775, AM2, AM2+ and AM3 ensures superior reliability and contact pressure. K8 (939, 940, 754) kits are available on request.
Incl. Noctua NT-H1 high-end thermal compound

Incl. Noctua NT-H1 high-end thermal compound

Noctua's NT-H1 is an award-winning TIM solution that provides minimum thermal resistance, excellent ease-of-use and long-term stability.
Cooler Specification
Intel Socket LGA775, AMD AM2/AM2+/AM3, Intel LGA1156/LGA1366 on request
Height (without fan)
125 mm
Width (without fan)
95 mm
Depth (without fan)
70 mm
Height (with fan)
125 mm
Width (with fan)
95 mm
Depth (with fan)
95 mm
Weight (without fan)
460 g
Weight (with fan/s)
550 g
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating
Intel all frequencies, AMD all frequencies
Fan compatibility
92x92x25 (2 fans can be installed)
Scope of Delivery
  • NF-B9 premium fan
  • Mounting-clips for 2 fans
  • Ultra-Low-Noise-Adaptor (U.L.N.A.)
  • Low-Noise-Adaptor (L.N.A.)
  • NT-H1 high-grade thermal compound
  • SecuFirm™ mounting kits for LGA & AM2(+)
6 Years
FAN Specification
Rotational Speed (+/- 10%)
1600 RPM
Rotational Speed with L.N.A. (+/- 10%)
1300 RPM
Rotational Speed with U.L.N.A. (+/- 10%)
1000 RPM
Acoustical Noise
17,6 dB(A)
Voltage Range
12 V
> 150.000 h
31.03.2008 // Icrontic.com

NH-U9B Review

Amazingly, the little NH-U9B bested almost every heatsink on the chart. It was only a degree or two behind its big brother, the NH-U12P and the Thermalright SI-128 SE. Very good! [...] As we discovered during the last heatsink roundup, Prime95 'Small FFT' testing puts significantly more strain on modern Intel processors than "Large FFTs". The NH-U9B had no issues coping with the extra heat load and kept its position in third. I have to keep reminding myself that this heatsink employs a 92mm fan! There are heatsinks more than twice its weight trailing behind it. [...] With two NF-B9 fans, we were able to match the performance of our reference fan, while still producing far less noise. Those who want high performance while keeping noise at a minimum will be very pleased with a dual NF-B9 configuration.
Test verdict: "Noctua does not disappoint with the NH-U9B. Outperforming almost all of our 120mm heatsinks, it is a phenomenal performer." (Mike D., Icrontic.com)
25.02.2009 // TweakTown.com

NH-U9B Review

In conclusion, I have to agree with Chris and everything he has told me about this company being true as could be. Noctua coolers not only can do a good job of ridding the CPU of its heat, but do it so quietly that it left me checking to see if the fans were even running. As far as tower style coolers go, with a small form factor in mind this is the quietest cooler I have tested yet. I have to say I am very impressed, to say the least. The well thought out overall design of the cooler doesn’t just stop there. Noctua takes it all the way into the mounting hardware. Noctuas take on getting a CPU to stay in a comfortable range of temperatures, while leaving the surrounding area virtually free of noise puts this cooler high in my list of favorites I have tested.
Test verdict: "The Noctua NH-U9B is a top notch in my book. It offers the best of all worlds in a very compact package." (Chad Sebring, TweakTown.com)
08.04.2008 // DragonSteelMods.com

NH-U9B Review

Seeing how small the NH-U9B is I was pleasantly surprised by the good performance of it, we can see also that even though it looks similar to the NH-U9F, the U9B has much better results, so something significant has changed during the re-design process.
Test verdict: "The NH-U9B is a quality addition to the Noctua line of CPU coolers, don't let its small size fool you, it performs just as good as coolers that are much larger than it." (Kristofer Brozio, DragonSteelMods.com)
19.08.2009 // VerdisReviews.com

NH-U9B Review

The overclocked results tell a similar story with the Noctua cooler way ahead and the extra fan taking off another degree at load, but both results are below 60 at 100% load which is certainly impressive.
Test verdict: "Noctua has impressed us no end here at Verdis Reviews with their consistent high quality and performance coolers. In this regard the NH-U9B is no different achieving some very solid temperatures despite the smaller build making it ideal for HTPCs and other smaller chassis." (Joe Blackmore, VerdisReviews.com)
06.07.2009 // Traficantesdehardware.com

NH-U9B Review

Bueno, el cooler de Noctua se comporta de manera sobresaliente, incluso al subir levemente el voltaje de nuestra cpu hasta los 1.343v llevándolo casi hasta los 3.9GHz se mantiene completamente firme y estables las temperaturas del Quad Core. Las temperaturas son muy bajas sobre todo destacando el pequeño tamaño del cooler. El nivel sonoro es extremadamente bajo, siendo inaudible si nos movemos por entorno de Windows, no esperábamos menos de este NF-B9.
Test verdict: "Nos hemos quedado sorprendidos del excelente rendimiento alcanzado por este pequeño disipador de cpu de Noctua, muy superior a coolers de mayor envergadura. El fabricante austriaco ha lanzado este NH-U9B al mercado para cubrir el sector de equipos HTPC o chasis pequeños, y ya decimos desde ahora que es si no el mejor, uno de los mejores disipadores del mercado para este sector." (Duarte Mourente Fernandez, Traficantesdehardware.com)
13.05.2008 // Puissance-PC.net

NH-U9B Review

Le NH-U9B affiche des performances tout à fait correctes, et qui deviennent même excellentes quand on se rappelle que nous avons affaire non pas à un grand ventirad tour de plus de 15cm de haut, mais d'un modèle d'à peine plus de 12cm ! Il se permet de faire à peu près jeu égal par exemple avec son ainé le NH-U12F, pourtant plus de 3cm plus haut. Son ventilateur est audible en 12V mais reste tout de même tout à fait acceptable, d'autant qu'il bénéficie de cette exceptionnelle qualité de fabrication Noctua qui fait que son bruit est assez agréable, chose que le sonomètre ne peut mettre en évidence. Ses 53dBA sont plus agréables à l'oreille que la plupart des ventirads affichant la même mesure acoustique.
Test verdict: "Tout comme son grand frère le NH-U12P, le NH-U9B est une belle réussite." (David Sergent, Puissance-PC.net)
04.04.2008 // Rexware.fr

NH-U9B Review

Les performances sont vraiment excellentes puique le Noctua NH-U9B se range au côté de ventirads avec ventilateurs de 120mm en étant un peu moins performant que le très bon Hyper 212 de Cooler Master. Il se paie le luxe de dépasser des mastodontes en 120mm comme l'Enzotech Ultra-X (mais à ventilateur horizontal). [...] Les NF-B9 sont vraiment très silencieux, on n'entend rien dans un environnement sonore normal.
Test verdict: "Noctua ne déroge décidément pas à sa réputation en proposant ce petit ventirad évolué. Petit mais très performant. Equippé des tous derniers produits Noctua (ventilateur NF-B9 à pâles crantées et pâte thermique NH-1), il est un excellent choix pour les personnes en quête de performances, silence et petite taille." (Mickaël Nicotera, Rexware.fr)
25.03.2008 // Gamezoom.net

NH-U9B Review

Dank des 4 Dual-Heatpipes-Systems und dem effektiven NF-B9 Premium-Lüfter (Vortex-Control Notches, SCD-Antriebssystem und SSO-Bearing) erzielt der neue Noctua Kühler eine mehr als beachtliche Kühlleistung. Selbst die Konkurrenzprodukte mit größerer Kühlfläche und üppigem 120 mm Lüfter können nur bedingt mit unserem Testmuster mithalten. [...] Selbst bei höchster Umdrehungszahl konnten wir den NF-B9 Premium-Lüfter nicht wahrnehmen. Aus diesem Grund können selbst Silent-User bedenkenlos zum Noctua NH-U9B greifen.
Test verdict: "Überragender Cooler mit kompakter Bauweise!" (Christoph Miklos, Gamezoom.net)
23.02.2010 // Techpill.lt

NH-U9B Review

Tai puikus aušintuvas tiems, kurie turi poreikį spartinti procesorių, tačiau neturi didelio pakankamai didelio korpuso, kuriame tilptų didelis aušintuvas su radiatoriumi. Pagal savo dydį NH-U9B SE2 parodė labai gerus aušinimo rezultatus, o turbinant procesorių sugebėjo palaikyti stabiliai veikiančią sistemą.
Test verdict: "Manau tai yra vienas iš geriausių kompaktinės klasės aušintuvų rinkoje." (Marius Kavaliauskas, Techpill.lt)
22.09.2009 // Tech-Review.de

NH-U9B Review

Unser Test konnte beweisen, dass nicht unbedingt die Größe Rückschlüsse auf die Kühlleisung geben muss. Natürlich konnte er nicht mit dem deutlich größeren Kühlkörper aus eigenem Hause mithalten, aber andere Konkurrenzprodukte sicherlich schlagen. Außerdem überzeugen uns die Ausstattung, u.a. auch die Wärmeleitpaste, die für sehr viele Anwendungen reicht, das tolle Montagesystem, das leider nur per Backplate funktioniert, die gute Kühlleistung und eine lange Garantiezeit.
Test verdict: "Dafür bietet Noctua [...] ein einmaliges Produkt, nämlich einen leistungsfähigen, recht leisen, kleinen Towerkühler der Edelklasse, der auch gewiss durch sein Aussehen positiv auffällt." (Gordian Hoffmann, Tech-Review.de)

Installation Manual (PDF)

Information Sheet (PDF)

Is the cooler compatible with socket AM2+ and AM3?

Yes. As AM2, AM2+ and AM3 are mechanically identical, the cooler is compatible with all three sockets.

Is the high weight dangerous for the CPU or socket?

No. Noctua coolers possess an extremely reliable SecuFirm™ mounting system. Thanks to the screw connection with the backplate on the rear side of the motherboard, the exceedance of the weight recommendations by Intel and AMD common among high-end coolers is completely unobjectionable.

Is it possible to mount fans with a greater height than 25mm?

Yes. The fan mounting clips grip to the screw holes in the lower edge of the fan frame and hence work with all fans regardless of their height. However, problems with the mounting of the fan can occur due to other parts within the case or fans with special frame designs, where the clips can't grip to the screw holes in the lower edge of the frame.

NH-U fan mounting

Is it possible to run two fans at a time?

Yes. Using the 4 supplied fan clips, you can mount two 120mm fans on the NH-U12(F/P) and two 92mm fans on the NH-U9(F/B).

Should the fan be mounted sucking away from the heat-sink or blowing onto the heat-sink?

Please install the fan blowing onto the heat-sink.

NH-U Airflow

If you're using two fans, please install them so that one blows onto the heat-sink and the other sucks the air away from the other side.

On which side of the heat-sink should the fan be installed?

Please install the fan so that the hot air can be disposed as good as possible either through the rear case fan (Airflow Option 1) or through the power supply (Airflow Option 2).

NH-U Airflow

Is it possible to cool my CPU without a fan (passive) using Noctua coolers?

Noctua coolers weren't originally designed for passive operation although the cooling performance is sufficient in many cases. Unfortunately, it is impossible for us to indicate whether a certain CPU can or cannot be cooled without a fan, as this depends on various factors such as case temperature, case ventilation or the orientation of the socket. Generally, we recommend using a fan in the first instance and then lowering RPM while constantly monitoring the temperature.

How to install the fan using the supplied steel clips?

First hook the clip into the notch of the heatsink:

Vibration Compensators Installation

Then hook the endings of the clips into the mounting holes of the fan:

Vibration Compensators Installation

What can I do if the fan blocks my RAM or chipset cooler?

In order to increase clearance, you can easily move the fan up a few fins as show below:

Vibration Compensators Installation

Which mainboards are compatible with the NH-U9B?

Please consult our mainboard compatibility list for information about compatible mainboards.

Can I use Noctua fans on my fan controller?

Our fans are compatible with the vast majority of fan controllers on the market. However, there is a compatibility issue with a few models such as the Zalman ZM-MFC2 and Bitfenix Recon, which apply Pulse Width Modulation (PWM) on the 12V line and use an unfavourable PWM carrier frequency. This can create an oscillation when used with certain fans, which will result in the fan speeding up and down. We therefore recommend not using the Zalman ZM-MFC2 or Bitfenix Recon with our fans.

I can’t spread the thermal compound by turning the cooler as described in the manual!

Due to the new LGA mounting bars with screw threads that facilitate the installation process, there's little room to turn the cooler as described in step 4 of the supplied manual. There's nothing to worry about though, as you can still turn the cooler by a few millimetres in order to help the thermal compound spread. We've also made the compound slightly less viscous so that the contact pressure of mounting system is wholly sufficient to spread it.

My fan doesn’t spin when I start up the PC - is it faulty?

If you've connected the fan directly (or using the supplied Low-Noise or Ultra-Low-Noise-Adaptors) to your mainboard, it's possible that the mainboard's automatic fan controller doesn't provide the required starting voltage due to the low CPU temperature. Please verify whether the fan starts spinning at higher CPU temperatures, remove any Low-Noise or Ultra-Low-Noise Adaptors, deactivate your mainboard's automatic fan controller in the BIOS or connect the fan directly to the power supply using the supplied 3:4-pin adaptor.

Can I run Noctua 3-pin fans on 4-pin PWM connectors and use my mainboard’s automatic fan controller?

You can simply connect our fan's 3-pin connector to the 4-pin PWM sockets of today's mainboards so that the fourth pin that transmits the PWM signal is left blank (due to the shape of the connector, there's no danger of reversing polarity). Some mainboards (e.g. current Gigabyte models) are capable of controlling fans not only via PWM, but also by adjusting the supplied voltage. In some cases, this may require you to change BIOS options like "Fan Control Mode" from "PWM" to "Voltage" or "Analog". Please consult your mainboard's manual in this regard. However, some mainboards use an "auto" setting by default that automatically chooses PWM or voltage based regulation according to the connected fan. Automatically controlling the fan speed may not possible on mainboards that pulse the power rather than lowering the fan voltage.


How can I connect 2 fans?

When using 2 fans, please connect one of the fans to the CPU-Fan header and the second fan to one of the Case-Fan headers of your mainboard. Alternatively, you can also use a 3-pin Y-cable in order to run both fans via the CPU-Fan header. Such cables are available in specialised retail stores.

The fan doesn’t start with the Ultra-Low-Noise Adaptor (ULNA)!

Unfortunately, many Gigabyte mainboards use a special control circuit that can lead to start-up problems in conjunction with the Ultra-Low-Noise Adaptor (ULNA). This control circuit remains active even when automatic fan control is disabled in the BIOS. In these cases, please use the fan without the ULNA or connect it directly to the power supply (or an external fan controller) in order to ensure reliable operation with the ULNA.

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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