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Noctua > 
Item#: N82E16835608021

Noctua NH-U9DX 1366 Dual Heat-pipe SSO Bearing Quiet CPU Cooler

  • 1600 RPM / 1300 RPM / 1000 RPM
  • 64.3 m3/h, 52.6 m3/h, 41.1 m3/h
  • SSO-Bearing
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Based on Noctua's compact NH-U9 series and fitted with the award-winning NF-B9 fan and NT-H1 thermal compound, the NH-U9DX 1366 forms a complete premium quality package that provides excellent quiet cooling performance for 4U Xeon 5500/5600 (LGA1366) workstations and servers. The new SecuFirm2 mounting system for socket LGA1366 is highly convenient and makes the NH-U9DX 1366 a tailor-made drop-in replacement for standard Intel coolers. To make your Xeon 5500/5600 systems quieter has never been so easy!

Caution: The 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 Noctua NH-U12P SE2 for these mainboards.

  • newegg SecuFirm2 for Socket LGA1366 Completely pre-installed, the new SecuFirm2 mounting system ensures maximum convenience and extremely short installation time.
  • newegg Drop-in replacement for standard Intel coolers SecuFirm2 for Socket LGA1366 is fully compatible with the original Intel installation system so that the NH-U9DX 1366 works as a simple drop-in replacement.
  • newegg NF-B9 92mm premium fan Featuring psychoacoustic optimizations and Noctua's premium-grade SSO-bearing, the award-winning NF-B9 is renowned for its exceptional quietness and long-term stability.
  • newegg 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.

Learn more about the Noctua NH-U9DX 1366


NH-U9DX 1366


Fan & Heatsinks
Fan Size
Intel Xeon 5500/5600 (LGA1366) (Backplate with screw threads for CPU cooler installation required)
Bearing Type
Rotational Speed (+/- 10%): 1600 RPM
Rotational Speed with L.N.A. (+/- 10%): 1300 RPM
Rotational Speed with U.L.N.A. (+/- 10%): 1000 RPM
Air Flow
Airflow: 64.3 m3/h
Airflow with L.N.A: 52.6 m3/h
Airflow with U.L.N.A.: 41.1 m3/h
Noise Level
Acoustical Noise: 17.6 dBA
Acoustical Noise with L.N.A.: 13.1 dBA
Acoustical Noise with U.L.N.A.: 7.9 dBA
Heatsink Material
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating

Physical Spec

Fan Dimensions
92 x 92 x 25mm
Heatsink Dimensions
Without Fan: 4.92" x 3.74" x 2.76"
With Fan: 4.92" x 3.74" x 3.73"
Without Fan: 1.0 lbs
With Fan: 1.2 lbs.


4 Dual Heat-Pipes, Raised Fin-stack of U-type Design for Perfect airflow direction and excellent compatibility with small case, HTPC system and others.

Award-winning, premium-grade SSO-bearing Fan ( NF-P9 ) achieves quietness and long-term stability.

SecuFirm Multi-socket mounting System for Socket 1366 (Application for Intel Xeon 55xx/56xx)and High-end Thermal Compound ( NT-H1 ).

Fan Input Power: 1,32 W
Fan Voltage Range: 12 V
Fan MTBF: > 150.000 hours

Package Contents

Package Contents
1x NH-U9DX Heatsink
1x NF-B9 fan
Mounting-clips for 2 fans
Ultra-Low-Noise-Adaptor (U.L.N.A.)
Low-Noise-Adaptor (L.N.A.)
NT-H1 thermal compound
SecuFirm2 mounting kit for LGA1366

Quick Info


  • Limited Warranty period (parts): 6 years
  • Limited Warranty period (labor): 6 years

Customer Reviews of the Noctua NH-U9DX 1366

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  • Brendan C.
  • 7/12/2013 5:52:30 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggsnice & quite

Pros: - super quiet
- came with thermal paste!

Cons: - no back plate
- fan blocks ram slot

Other Thoughts: I don't own a Xeon, but I have an i7 980 which came with a stock fan that used a back plate. success! I had originally tried to put the fan on one side to avoid issues with the RAM - but when the system started rebooting I swapped it back to the other side so it pushes air into the rear 120mm fan outtake. so far so good! But I'm now 12gb short on ram. Possible low profile memory could fit under the fan...

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  • Geoffrey R.
  • 7/8/2013 1:30:04 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsQuiet Cooler

Pros: It is very quiet and does its job well. It also has room for a second fan on the opposite end, but it only comes with one fan out of the box. It comes with a mounting tool and thermal paste. It looks pretty cool in my case through the side window, too.

Cons: It is pretty big, so be careful what size case you try to put this in. I put mine in a full size ATX case and I had no problem. It can also be a bit difficult to mount, as the cooler has to be attached to the board and CPU before the fan can be attached to the cooler.

Other Thoughts: The cooler is slightly off-center, so depending on how it's oriented, the fan may stick out a bit farther on one side, which in my case, got in the way of RAM slots. Check its position before applying thermal paste and mounting it.

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  • john r.
  • 1/1/2013 4:29:31 PM
  • Tech Level: High
  • Ownership: less than 1 day

5 out of 5 eggsOMGosh These Screws

Pros: Looks like I accidently reviewed this one instead of the AMD G34 version (NH-U9DO A3 AMD Opteron). so my previous review with the two stars applies to that one not this one.

Cons: not sure, never tried it.

0 out of 1 people found this review helpful. Did you? Yes No

  • john r.
  • 12/20/2012 5:29:15 PM
  • Tech Level: High
  • Ownership: less than 1 day

2 out of 5 eggsOMGosh These screws

Pros: Looks great, other than that I cannot tell because I cannot assemble it. But it looks really really cool so 2 eggs for style.

Cons: the screws holding the brackets to the heatsink are extremely difficult to put in, in fact I cannot put them in.

Other Thoughts: I have been screwing things together all my life. I r a mechanic and engineer and they just didnt leave enough room to use a tool on them. its necessary to use your fingers to run them down to the point that you can get the allen wrench on them to finish but then cannot be started. you, know - if you just knurled the ends of the screws and put pilot tips on them it might make it possible to put them in. 45 minutes I have been screwing with these screws and not one yet.

0 out of 4 people found this review helpful. Did you? Yes No

  • Stephen D.
  • 8/12/2012 2:29:04 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsOutstanding quality

Pros: Excellent Construction.
Good installation manual
Very quiet, due to large fans.
Extra fan supplied

Cons: Correct fan orientation could be more clear.

Other Thoughts: Even though this cooler is large, I was able to install two of them on a Supermicro X8DTH-IF motherboard, which is an ATX form factor server mother board.

1 out of 1 people found this review helpful. Did you? Yes No

  • Paul C.
  • 7/24/2012 9:11:18 AM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsNeeds a backplate

Pros: If you have a backplate already on your mainboard, it might work just fine.

Cons: "The NH-U9DX 1366 doesn't come with a backplate and thus requires a mainboard with a backplate." My mainboard didn't have a backplate, and so now I just have scrap metal. Make sure your board has a backplate before you order this, or you won't be able to screw the cooler into anything.

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  • connie K.
  • 4/19/2012 3:51:15 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsawesome cooler

Pros: super easy install. comes mostly assembled. very quiet. i have two of these on my sr-2 motherboard atop 2 xeon 2.4 ghz six cores and it runs about 40 celsius. couldnt be happier.

Cons: none.

Other Thoughts: easy easy easy. if you cant figure this out go practice on a lego set for five year olds and youll have it down.

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  • Anonymous
  • 2/20/2012 7:28:51 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsawesomesauce

Pros: This thing is HUGE! definitely a good heatsink for the SR2 or any dual motherboard. The fans included are very quiet with decent cfm. The clips are easy...and don't stick out IF you put them on right. Also...when I put them on I put the bottom part of the clip on first because of the lack of space between the cooler and ram. basically, If you use your noggin the clips are not a problem--and are wayyy better than screws.

Cons: This thing is HUGE! -- which is good for air and bad for small cases/boards. I won't take away an egg for this because its a cpu cooler -- It does its job better with that massive surface area. Also, the fan. I'm not a fan of the color, I would have preferred black. Its not a big deal though, because the clips fit any 92mm fan -- so I replaced the fans with loud 100cfm ones (because I'm crazy and want more powa).

Other Thoughts: Unless you're crazy, like me, this cpu cooler is perfect.

1 out of 2 people found this review helpful. Did you? Yes No

  • Mark B.
  • 1/10/2012 12:07:13 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: I give this a 5, but not a "perfect" 5.

It gets a '6' for quality:

4 heat pipe bores, a very solid machined finish thermal interface plate, high quality and stiff U brackets to transfer the load to the LGA1366 mounting holes, high quality spring fasteners (socket head cap screws) with an extra long hex wrench to screw them down. All the aluminum has a nickel plated finish. Fans have anti-vibration strips. Super high-quality Noctua SSO fans. This kit comes with one fan but has the clips to mount another 92 mm fan to the other side of the cooler (this is perfect because the long PCI support bracket on my Lian Li case would not allow a 120 mm cooler to be installed). Just top notch quality.

Cons: However I give it a '4' for installability.

I have a 2 CPU Supermicro motherboard. And the cooler on CPU unit 1 installed like a breeze. The clip design is very clever, and as long as you have room to get your fingers in, you can install the fan with no problem.

Not so easy with CPU #2. The 2nd CPU socket is biased to the top of the MB. You have to install the Heat sink without the fans first, since you have to access the screws from the top. The install the clips to hold the fans. On the top side of the cooler this gives no room to the top of the case. Fortunately I was able to unbolt the top rail of my case (it was riveted at the other end) to move it aside just enough to get my finger in. And with a pair of needle nosed pliers I was able to grab the bottom of the fan clips and move them into place.

Other Thoughts: If Noctua reads this and would consider a slight redesign:

make the mounting screws have a allen wrench insert like they have now, and a hex head top so you can use a small wrench so that you can screw the fasteners in from the side, not the top. This way you would have the option of either installing it using the current method (screw from the top and then attach fans) or an alternative method (attach the fans first then screw in from the side with a small wrench).

It was not a big deal though. I was able to get it installed with after about 20 minutes of aggravation. But the coolers work like a dream.

I have two 5620s and under full load they stay nice and cool with these Coolers (and quiet too!). Super high-quality and definitely worth the price IMO.

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  • Matthew G.
  • 12/4/2011 12:52:32 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsVery Large

Pros: Very quiet and effective at cooling.

Cons: If you're building a dual-processor machine, watch out.

These heatsinks are so big that in a dual-xeon ATX motherboard such as the asus z8na-d6, the two fans can't be mounted on the same side of the heatsinks, because the wire fan clasps stick out quite a bit on each side.

Solution is to have fans blowing in opposite directions, which seems like a bad idea, or to use different hardware to attach the fan to the heatsink.

Also, 3 -pin fans (no pwm), if that matters.

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Item#: N82E16835608021
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