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Noctua's DX line of coolers has become a default choice in high performance quiet cooling solutions for Intel Xeon CPUs. The latest i4 revision supports LGA2011 (both Square ILM and Narrow ILM), LGA1356 and LGA1366 based Xeon platforms and the 9cm model NH-U9DX i4 comes equipped with two of Noctua’s award-winning NF-B9 premium fans with PWM for automatic speed control. Standing 125mm tall, the NH-U9DX i4 combines outstanding quiet cooling efficiency with full 4U compatibility. Fitted with the professional SecuFirm2™ mounting system and bundled with Noctua's industrial-grade NT-H1 thermal compound, the NH-U9DX i4 forms a complete premium quality package for quietly cooling Xeon based workstations and servers.
Details
Award-winning NH-U series

Award-winning NH-U series

The NH-U9DX i4 is based on the latest version of Noctua's award-winning NH-U9 coolers. First introduced in 2005, the NH-U series has become a standard choice for premium quality quiet CPU coolers and won more than 400 awards and recommendations from leading international hardware websites and magazines.
4U Compatibility

4U Compatibility

Sporting four heatpipes, a surface area of more than 3800cm² and two premium grade 92mm fans, the NH-U9DX i4 provides a significant upgrade in quiet cooling performance compared to common 2U solutions. At the same time, its 125mm height makes it fully compatible with standard 4U cases.
2x NF-B9 92mm Premium Fan

2x NF-B9 92mm Premium Fan

The award-winning NF-B9 92mm premium fan features Noctua's renowned SSO bearing as well as advanced aerodynamic optimisations such as Bevelled Blade Tips and Vortex-Control Notches. In order to achieve its superb quiet cooling capability, the NH-U9DX i4 comes equipped with two NF-B9 fans in a push/pull setup.
PWM support and Low-Noise Adaptor

PWM support and Low-Noise Adaptor

The NF-B9 92mm fans supplied with the NH-U9DX i4 support PWM for convenient automatic speed control through the mainboard. In addition, the maximum fan speed can be reduced from 1600 to 1300rpm using the supplied Low-Noise Adaptors for even quieter operation.
SecuFirm2™ mounting system

SecuFirm2™ mounting system

Noctua's SecuFirm2™ mounting systems have become synonymous with quality, safety and ease of use. Supporting Intel's LGA2011 (both Square and Narrow ILM), LGA1356 and LGA1366 Xeon platforms, the SecuFirm2™ mounting included with the NH-U9DX i4 guarantees perfect contact pressure and maximum convenience on all sockets.
NT-H1 thermal compound

NT-H1 thermal compound

Having received more than 100 awards and recommendations from hardware journalists around the world, Noctua's NT-H1 is a proven professional 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-B9 models feature an MTBF rating of more than 150.000 hours and the entire NH-U9DX i4 package comes with a full 6-year manufacturer's warranty.
NH-U9DX i4
Cooler Specifications
Intel LGA2011-0 & LGA2011-3 (Square ILM & Narrow ILM), LGA1356, LGA1366 (wtih Xeon backplate)
Height (without fan)
125
Width (without fan)
95
Depth (without fan)
71
Height (with fan)
125
Width (with fan)
95
Depth (with fan)
95/120*
Weight (without fan)
460
Weight (with fan/s)
550/640*
Material
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating
Fan compatibility
92x92x25
Scope of Delivery
  • 2x NF-B9 PWM premium fan
  • Low-Noise Adaptor (L.N.A.)
  • NT-H1 high-grade thermal compound
  • SecuFirm2™ Mounting Kit
Warranty
6 Years
FAN Specification
Bearing
Max. Rotational Speed (+/- 10%)
1600
Max. Rotational Speed with L.N.A. (+/- 10%)
1300
Min. Rotational Speed (PWM, +/-20%)
300
Max. Airflow
64,3
Max. Airflow with L.N.A.
52,6
Max. Acoustical Noise
17,6
Max. Acoustical Noise with L.N.A.
13,1
Input Power
0,96
Voltage Range
12
MTBF
> 150.000
NH-U9DX i4
05.02.2016 // PC Ekspert
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NH-U9DX i4 Review

Kod overclockinga nismo koristili low noise adaptere nego smo mjerenja samo izvršili pri punim brzinama ventilatora. Rezultat nije nimalo loš kada je u pitanju veći U12DX hladnjak koji očito bolje funkcionira pod većim opterećenjem jer je ovdje za 3°C bolji od i32. U9DX s oba ventilatora i u punoj brzini drži procesor na iznimno vrućih maksimalno zabilježenih 95°C. Prosjek maksimalnih temperatura za U12DX iznosi 83.13°C, za U9DX 87.1°C, za i32 86.5°C i za D15 80.33°C. Maksimalna potrošnja sistema je iznosila 275 W.
Test verdict: "Noctua već neko vrijeme vješto koristi svoje umijeće i postojeće desktop modele kako bi proširili tržište i na workstation/server segment. Dokaz tome su i ova dva modela, koji su poznate Noctuine premium kvalitete, jednostavnog načina montaže ali i dobrih performansi." (Krešimir Matanović, PC Ekspert)
16.06.2015 // Tom's Hardware
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NH-U9DX i4 Review

Dynatron uses thick fans with heavy duty motors to produce high air pressure through narrowly spaced fins, yet even its powerful 80mm cooler can’t stand up to the cooling capacity of Noctua’s 92mm NH-U9DX i4. Dynatron’s fans also override motherboard fan settings, making it impossible to hold a moderate fan speed if the CPU is even a little warm. [...] Decibels are a logarithmic scale, so an increase of ten decibels has twice the sound pressure level. That means the R27 is nearly four times as noisy as the NH-U9DX i4, and the R24 is nearly twice as noisy as the R27.
Test verdict: "The NH-U9DX i4 is the clear winner in value, noise and cooling power" (Thomas Soderstrom, Tom's Hardware)
03.12.2014 // Phoronix.com
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NH-U9DX i4 Review

The Noctua heatsink was allowing the eight-core CPU to operate around eight degrees cooler than the Arctic Alpine 20 Plus heatsink fan that I was using previously on this system. This Noctua heatsink is also very quiet while offering great performance.
Test verdict: "I've now been using this heatsink for over a month and it's been working out great for my range of LGA-2011 v3 CPUs." (Michael Larabel, Phoronix.com)
02.06.2014 // GreenTechReviews.ru
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NH-U9DX i4 Review

Как видно из тестирования, Noctua NH-U9DX i4 продемонстрировал изумительные результаты при чрезвычайно низком уровне шума! Качество продукта, эффективность охлаждения, уровень шума — всё по высшему разряду. Как и цена. Но NH-U9DX i4 определённо стоит своих денег!
Test verdict: "Если вы ищете замену своим штатным кулерам в рабочей станции, то мы смело можем рекомендовать Noctua NH-U9DX i4 к покупке!" (Владимир Солонин, GreenTechReviews.ru)
18.10.2013 // HD Technology
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NH-U9DX i4 Review

Oggi vi mostreremo il nuovo prodotto di casa Noctua, azienda che non ha bisogno di essere presentata, nota a tutto il mondo per i propri prodotti affidabili e di fascia alta. Annunciati pochi mesi fa, l’azienda ha rilasciato un nuovo dissipatore che prende il nome di , Noctua NH-U9DX i4, prodotto destinato a raffreddare i bollenti spiriti delle soluzioni LGA2011/LGA1356 e LGA1366.
Test verdict: "Non riuscendo a provare il modello precedente non possiamo dirvi se o meno il prodotto è migliorato, ma dalla successione di tutti i prodotti Noctua il miglioramento si è sempre notato. NH U9DX i4 si è mostrato veramente un processore degno di nota. La potenza di raffreddamento è impressionante cosi come il livello di rumore pressoché nullo." (Victor Italiano, HD Technology)
04.09.2013 // Turkchip.com
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NH-U9DX i4 Review

Noctua NH-U9DX i4 performans olarak Corsair H110 sıvı soğutmalı soğutucunun biraz gerisinde kalırken abisi D14 kadar performans gösterdi.
Test verdict: "Noctua NH-U9DX i4 kullanılan malzemelerin kalitesi, yüksek soğutma performansı, zengin kutu içeriğinin yanısıra sessiz çalışması ile Turkchip Silver Award ödülünü hak eden başarılı bir ürün." (Murat Yildirim, Turkchip.com)
30.05.2013 // mod-your-case.de
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NH-U9DX i4 Review

Auch wenn die vom neuen NH-U9DX i4 erbrachte Kühlleistung trotz der zwei verbauten Lüfter nicht an die des kürzlich getesteten, neuen NH-U12DX i4 herankommt, so hat auch der NH-U9DX i4 seine Vorzüge. Wo der NH-U12DX i4 sein Einsatzgebiet eher noch in einer Workstation sieht, richtet sich der NH-U9DX i4 eher an lärmbewusste Betreiber von Servern in 4HE-Gehäusen, welche dennoch nicht auf eine ausreichende Kühlleistung verzichten wollen. In diesen findet der NH-U9DX i4 problemlos platz, auch wenn ein Mainboard mit zwei oder vier Prozessoren zum Einsatz kommt. [...] Die Kühlleistung konnte im Vergleich zu dem von Intel angebotenen Kühler ebenso wie der Geräuschpegel überzeugen. Die Montage ist schnell und zudem sicher zu bewerkstelligen. Der rund 60€ teure NH-U9DX i4 kann zudem durch eine sehr gute Verarbeitung glänzen.
Test verdict: "Nachdem schon der NH-U12DX i4 durch seine Kühlleistung und den geringen Geräuschpegel überzeugen konnte, hat auch der NH-U9DX i4 in unserem Test sein Können unter Beweis gestellt und glänzt mit einem sehr guten Kühlergebnis." (Patrick Seus, mod-your-case.de)

Installation Manual (PDF)

Information Sheet (PDF)

Does the mounting-system of the NH-U12DX i4/NH-U9DX i4 support LGA2011 based Xeon platforms with Narrow ILM?

There are two different types of ILM (Independent Loading Mechanism) for Intel’s LGA2011 based Xeon CPUs: Square ILM with 80x80mm hole spacing and Narrow ILM with 56x94mm hole spacing. The mounting system of the NH-U12DX i4/NH-U9DX i4 is fully compatible with both types:

Xeon Compatibility

Is the cooler compatible with all LGA1366 mainboards?

The DX models (NH-U12DX i4, NH-U9DX i4, NH-U12DX 1366, NH-U9DX 1366) can only be used on mainboards that have a backplate with screw threads for CPU cooler installation (such as the Intel reference backplate for Xeon 5500). The cooler is thus incompatible with Xeon 3500 and Core i7 mainboards that don’t have such a backplate. Please choose our normal retail models with LGA1366 support (or NM-I3 kit) for these mainboards.

1366 compatibility

Does the mounting-system of the NH-U12DX i4/NH-D9DX i4 3U/NH-U9DX i4 support LGA2011 based Xeon platforms with Narrow ILM?

There are two different types of ILM (Independent Loading Mechanism) for Intel’s LGA2011 based Xeon CPUs: Square ILM with 80x80mm hole spacing and Narrow ILM with 56x94mm hole spacing. The mounting system of the NH-U12DX i4/NH-D9DX i4 3U/NH-U9DX i4 is fully compatible with both types:

Xeon Compatibility

Can Noctua coolers be installed on LGA2011 Narrow ILM platforms?

The NH-U12DX i4 and NH-U9DX i4 include mounting hardware for LGA2011 Narrow ILM. Other models are mechanically incompatible with the Narrow ILM mounting system and can thus not be used on this platform.

Which sockets are supported or can be supported using upgrade kits?

Please refer to our socket compatibility chart.

Is the cooler compatible with the LGA2011-3 socket?

Yes. Due to the heatsink mounting mechanism being identical on LGA2011-0 and 2011-3, the cooler supports both types of LGA2011-3.

My Noctua PWM fan starts to spin when the PC boots but then stops, what is wrong?

Some mainboards feature 4-pin fan headers that actually don‘t use a PWM signal on Pin 4 to control the fan speed but rather reduce the voltage on Pin 2 (like a standard 3-pin fan header). In this case, it may occur that the mainboard reduces the voltage so much that the fan stops. Please refer to your mainboard manual to check whether or not your mainboard has 4-pin fan headers that control the fan speed by reducing voltage on Pin 2 rather than by changing the PWM duty cycle on Pin 4:

4 pin fan header types

Note that mainboard manufacturers use different terms to indicate that Pin 4 is not being used for PWM control (e.g. “+5V”, “VCC” or “NC”), but if one of these terms is used, you can be sure that the fan header does not support PWM. If Pin 4 is described as “Speed Control” or “PWM” or the like, you can be sure that the fan header supports PWM.

Unfortunately, the description of Pin 2 is not always a clear indication as some manufacturers use terms such as “Fan PWR” or “Power” for both types of fan headers. However, if Pin 2 is described as “Speed Control”, you can also be sure that the fan header does not support PWM based speed control. If Pin 2 is described as “+12V”, this is a clear indication that the fan header supports PWM.

Please also note that in some cases, the descriptions of the pin layouts in the mainboard manuals may not be correct and some models actually allow you to switch the fan headers from voltage control mode to PWM control mode in the BIOS even though the pin descriptions do not indicate PWM support. We thus recommend to look for these options in the BIOS before taking other measures. In case of doubt, please contact your mainboard manufacturer.



To resolve the issue, you can:

  1. Choose a higher fan speed profile in the BIOS (e.g. „normal“ instead of „silent“, etc.) or deactivate automatic fan speed control and use a Low-Noise Adaptor instead.

  2. Use the mainboard‘s fan speed control software or 3rd party tools like Speedfan to regulate the fan speed. Unlike BIOS based fan speed control, the supplied software usually checks whether the fan has stopped and increases voltage accordingly or at least offer more options to set up the fan properly.

  3. If your mainboard features other 4-pin fan headers that use PWM for speed control, you can run multiple fans from these headers using Y-split cables. Make sure not to exceed the specified maximum power draw of the fan headers (usually 10-12W) though.

My Noctua PWM fan runs at a much higher minimum speed than advertised, what is wrong?

The specified minimum speed refers to the speed at 20% PWM duty cycle. There can be several reasons why the fan doesn‘t go as low as indicated:

  1. Many mainboards do not go below 40%, 50% or even 60% PWM duty cycle on case fan headers. Please refer to your mainboard manual to verify whether the fan header actually goes down to 20% duty cycle. If that's not the case, in some cases you can use the fan speed control software supplied with your mainboard to overcome these limitations and reduce the fan speed even further. However, 3rd party tools like SpeedFan offer greater flexibility and better options to work around the limitations imposed by the mainboard vendors.

  2. Some mainboards feature 4-pin fan headers that actually don‘t use a PWM signal on Pin 4 to control the fan speed but rather reduce the voltage on Pin 2 (like a standard 3-pin fan header). As the fan speed at minimum voltage is usually higher than the speed at 20% PWM duty cycle, the fan can not reach as low minimum speeds under voltage control as under PWM control. Please refer to your mainboard manual to check whether or not your mainboard has 4-pin fan headers that control the fan speed by reducing voltage on Pin 2 rather than by changing the PWM duty cycle on Pin 4:

    4 pin fan header types

    Note that mainboard manufacturers use different terms to indicate that Pin 4 is not being used for PWM control (e.g. “+5V”, “VCC” or “NC”), but if one of these terms is used, you can be sure that the fan header does not support PWM. If Pin 4 is described as “Speed Control” or “PWM” or the like, you can be sure that the fan header supports PWM.

    Unfortunately, the description of Pin 2 is not always a clear indication as some manufacturers use terms such as “Fan PWR” or “Power” for both types of fan headers. However, if Pin 2 is described as “Speed Control”, you can also be sure that the fan header does not support PWM based speed control. If Pin 2 is described as “+12V”, this is a clear indication that the fan header supports PWM.

    Please also note that in some cases, the descriptions of the pin layouts in the mainboard manuals may not be correct and some models actually allow you to switch the fan headers from voltage control mode to PWM control mode in the BIOS even though the pin descriptions do not indicate PWM support. We thus recommend to look for these options in the BIOS before taking other measures. In case of doubt, please contact your mainboard manufacturer.


    If your mainboard features other 4-pin fan headers that use PWM for speed control, you can run multiple fans from these headers using Y-split cables. Make sure not to exceed the specified maximum power draw of the fan headers (usually 10-12W) though.

I'm experiencing fan speed issues with my motherboard from Supermicro, what can I do?

The BIOS of many motherboard models from Supermicro expects a certain minimum fan speed (usually 700rpm), which is higher than the minimum fan speed that can be achieved with Noctua's PWM fan models. The BIOS may interpret the low minimum RPM of Noctua fans as a fan error and thus try to run the fan at 100% for a short period before going back to automatic control.. This can result in oscillating fan speeds and fan speed warnings in the BIOS or the fan management console.

Unfortunately there is usually no option to set a lower minimum value that would suit the low minimum speed of Noctua PWM fans.The issue can thus only be resolved by either disabling automatic fan speed control in BIOS, which will cause the fans to run at a constant speed, or by requesting a modified BIOS file from Supermicro, which takes the minimum fan speed of Noctua fans into account (charges might apply).

Should I take the cooler off before transporting my system?

Due to the low weight of the cooler, it is not necessary to take it off for transport.

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