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Item#: 9SIA5TY2014055

Noctua NH-U9DO A3 AMD Opteron, 4 Dual Heat-pipe SSO Bearing Quiet CPU Cooler

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Noctua's DO line of coolers has become a default choice when it comes to quietly cooling AMD Opteron CPUs. Upgrading both compatibility and performance, the new A3 model features Noctua's professional NM-A3 SecuFirm2 mounting system that not only supports socket G34, C32 and F, but also allows to install the cooler turned by 90°. Thanks to six heatpipes, a performance optimized fin stack and its two premium grade NF-B9 92mm fans, the compact NH-U9DO A3 cools Opteron processors up to a thermal design power (TDP) of 115W at minimum noise levels. Bundled with Noctua's industrial-grade NT-H1 thermal compound and fitting standard 4U chassis, the NH-U9DO A3 forms a complete premium quality package for quietly cooling AMD workstations and servers.

Caution: Due to its more compact design and quiet operation, the NH-U9DO A3 is approved only for processors with up to 115W thermal design power (TDP). Using the NH-U9DO A3 on higher TDP processors may be possible with increased case ventilation depending on the specific configuration but is not officially supported by Noctua.

  • newegg Performance optimized design The NH-U9DO A3 is based on Noctua's much acclaimed NH-U series which have received more than 300 awards and recommendations from the international press. Six heatpipes, a performance optimized fin stack and an enlarged contact surface suitable for socket G34 allow for further improved performance.
  • newegg Supports G34, C32 and Socket F Thanks to the new NM-A3 SecuFirm2 mounting system that includes brackets with both 3.5" and 4.1" hole spacing, the NH-U9DO A3 supports Socket F as well as the newer G34 and C32 sockets.
  • newegg Can be turned by 90° for optimal compatibility and positioning Noctua's NM-A3 SecuFirm2 mounting system makes it possible to install the cooler rotated by 90° in order to allow for an optimal positioning of the cooler and to evade compatibility issues on dual socket mainboards.
  • newegg Drop-in replacement for standard AMD coolers Screwing directly to the standard AMD backplate, the NM-A3 SecuFirm2 mounting system makes the new A3 revision a true drop-in replacement. Choose the appropriate mounting brackets, fix the two spring screws and you're done!
  • newegg 2x NF-B9 92mm premium fan Featuring advanced aerodynamic optimizations and Noctua's premium-grade SSO-bearing, the award-winning NF-B9 is renowned for its exceptional quietness and long-term stability. The dual fan configuration allows for increased performance and safeguarding against failure.
  • newegg NT-H1 thermal compound Noctua's much-acclaimed NT-H1 is a well proven pro-grade TIM solution that provides minimum thermal resistance, excellent ease-of-use and outstanding reliability, which makes it suitable for use in professional server and workstation environments.

Learn more about the Noctua NH-U9DO A3




Fan & Heatsinks
Fan Size
AMD G34, C32, F (3.5" & 4.1")
Bearing Type
1600 RPM (standard), 1300 RPM (w/ L.N.A), 1000RPM (w/ U.L.N.A.)
Air Flow
64.3m3/h (standard), 52.6m3/h (w/L.N.A.), 41.1m3/h (W/ U.L.N.A)
Noise Level
17.6 dBA (standard), 13.1dBA (w/ L.N.A), 7.9dBA (w/ U.L.N.A.)
Heatsink Material
Copper (base and heat-pipes), aluminium (cooling fins), soldered joints & nickel plating

Physical Spec

Fan Dimensions
92 x 92 x 25mm x2
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.


Performance optimised design

Supports G34, C32 and Socket F

Can be turned by 90 Degrees for optimal compatibility and positioning

Drop-in replacement for standard AMD coolers

2 x NF-B9 92mm premium fan

NT-H1 thermal compound

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

Package Contents

Package Contents
2 x NF-B9 premium fan
2 x Ultra-Low-Noise Adaptor (U.L.N.A.)
2 x Low-Noise Adaptor (L.N.A.)
Y-Split Cable
NT-H1 high-grade thermal compound
SecuFirm2 Mounting Kits

Quick Info


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

Customer Reviews of the Noctua NH-U9DO A3

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  • N/A
  • 5/22/2014 5:39:45 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggs

Pros: I was not able to use this heatsink due to the wrong mounting alignment or lack of bracket as noted below however you can tell just by looking at the construction and materials involved that this is a quality heatsink/fan combo. The instructions and supplies included are plentiful and helpful compared to other brands as well.

Cons: When purchasing this heatsink/fan combo I hastily ordered the item when i saw it was on sale. In the Product title it is listed as "A3 AMD" and NOT "AM3+". This Item will NOT fit on those boards with the included items. This seemed misleading albeit I should have looked closer on the product spec's page.

Other Thoughts: If I was able to use this product I would have rated it accordingly however the low rating is more due to the product listing since I am not able to use the device as intended.

Being that I lose over half of what I spent just trying to get it back to new egg, I think I will take my business elsewhere after this more than disappointing purchase.

1 out of 3 people found this review helpful. Did you? Yes No

  • Bloo-Mahrz
  • 1/26/2014 8:54:39 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsNoctua

Pros: Runs quiet and cool. Even without the included noise dampening power links.

Cons: I'm not complaining but these monsters are HUGE. There's 2 fans, 1 blowing into the heat sink, and 1 sucking air out. When sitting the fans evenly on the heat sink the fan can get in the way of other components such as RAM chips. However the fan location is adjustable so if I expand RAM later on I can raise the fan up a bit so I can fit it in. It just won't look perfect and could possibly affect cooling slightly.

Other Thoughts: Seems like a high quality product.

Did you find this review helpful? Yes No

  • N/A
  • 1/22/2014 10:36:58 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsBest C32 cooler

Pros: Very easy to fit once assembled*
Fan attachment is simple yet effective (no rubber things to pull through)
Heatsink is a thing of beauty

Cons: *Attaching the processor brackets (G34 or C32) with the small screws is annoying since they are slick and cannot readily be thumb tightened.

Other Thoughts: Inclusion of the tall hex key is thoughtful.
Two of these together on a SuperMicro H8DCL means you'll have to only have fans 'pushing' since there will be no room to mount them if you have the heatsinks mounted inline with airflow (front to back of case). If you mount perpendicular to the case airflow, you can fit both fans.

In the 4U case I have, there is plenty of airflow anyway and the heatsinks work great.

Did you find this review helpful? Yes No

  • Ryan
  • 11/26/2013 1:24:34 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsHUGE, but awesome

Pros: I have two of these cooling Opteron 4334s and they work great. These CPUs running numerous VMs never get hot.

Cons: Very large. Only 3 pin connectors.

Did you find this review helpful? Yes No

  • N/A
  • 11/2/2013 10:07:19 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsStrong CPU cooler but HUGE!!

Pros: This CPU cooler simply is AMAZING! Quality is phenomenal and it ships with way too many accessories but I guess for the price tag its alright.

Cooling performance is also phenomenal. Under full load on all 6 cores, my Opterons 4334 are kept at around 35C which is pretty low if you ask.

The fans are hyper silent (you dont even head the air passing thru).

Assembly is easy and precise. Component machining is top of the line.

Cons: The instruction sheet is garbage. Most of the pictures are totally wrong (not showing the proper component options for the socket C32) and it is cryptic to follow. Thanks to my experience assembling computers, I did not use the instructions at all.

The thermal paste that came with the heatsinks is known to be low quality so I used Arctic Cooling MX-2 instead.

Finally, the SIZE. Its HUGE. Seriously its big, but since it cools very well my opteron cpu's even under full load, is it still a disadvantage? I dont think so but be warned. In my full tower Lian Li case, they barely fit.

Did you find this review helpful? Yes No

  • econcepts
  • 9/30/2013 5:46:25 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsMy second one

Pros: I used this with G34. beautifully constructed (engineering is another matter), flow can be directed in any direction (brilliant). good materials, comes with various resistors for fan speeds.

Cons: the one and only con, has always been attaching the mounts to the base - its a total pita. You can barely get the screws in between the fins and the base let alone turn them. When you do finally get them in, the wrench will only turn about 50 degrees before having to reposition it.

Other Thoughts: if they just designed the fins so that the Allen wrench could go through them to the screws, the problem would be solved with minimal loss of cooling (might even help having the extra holes in the fins).

Did you find this review helpful? Yes No

  • pathiaki
  • 9/25/2013 6:06:56 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsIt's HUGE

Pros: Ok... I've seen big, but this thing requires at least 3U. It is massive, has two fans and it is QUIET. Not only that, it keeps the CPU (C32 4334) below 45C at full tilt. I read a lot of the reviews on this and people couldn't figure out how to put it together? Really? Let's stop being guys and be men and read the directions. It takes about 15 minutes.

Cons: It's massive. The board I have is a dual proc and I'm seriously doubting that when I go to add the second CPU I'll be able to put another of these next to as they will probably hit.

Other Thoughts: I went with two other heat sinks prior to this. The CPU was either overheating or on the edge . Due to this, it caused capacitor whine on those two boards. Now that I have the new board, the capacitors didn't whine and the CPU just flagged overheat in the BIOS. That's not the case any longer

Did you find this review helpful? Yes No

  • N/A
  • 6/17/2013 6:36:14 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsQuiet but large

Pros: Very quiet

Cons: Took a while to assemble, very large

Other Thoughts: Documentation was sketchy - I will be able to install the second one more easily. It comes with two bracket sets, and I guessed which one to use incorrectly. There is no indication of how to install the fan clips, and it took a while to figure that out. On my Supermicro H8DG6-F motherboard it sticks out over 2 memory slots. I was able to install the memory first, but that means I can't remove the memory without first removing the heatsink. Not a big problem.

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

  • Makotosan
  • 4/17/2013 9:15:50 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsExcellent fan

Pros: The size of this heatsink/fan makes it ideal for a 4U server. I'm using this on an Opteron 4386 in a ASUS KCMA-D8 motherboard and it is the right size for it. It is also really quiet, especially compared to the louder case fans that came with my server case.

Very simple to install as well. Comes with everything you need, such as wrench and thermal paste.

Cons: When using the L-shaped hex wrench vertically, the handle is really small and uncomfortable to turn. I ended up holding the wrench with some vice grips and this made it a lot easier.

Other Thoughts: I read some of the bad reviews about getting the screws in for the brackets and can possibly see where that might be difficult to get started if you have larger fingers. I'd say I have average to slender fingers and had no problems with the 4 screws that attach the brackets to the heatsink.

On an 8 core Opteron 4386, I'm averaging about 104 degrees F with light loads (running 5 virtual machines).

Did you find this review helpful? Yes No

  • GJL
  • 1/20/2013 3:58:25 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsScrews don't fit

Pros: Looks sturdy

Cons: I spent more than an hour to insert the screws to the base. They don't fit. The screw driver in the box does not fit the head of screws, either. I have been building computers over 10 years. This is the worst cooler ever purchased to assemble.

Other Thoughts: When you spend $80 for this cooler, it should not be so difficult to insert a screw to the base.

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

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