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Noctua NH-L9a-AM4, Premium Low-Profile CPU Cooler for AMD AM4 (Brown)

4.8 out of 5 stars 1,804 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer CPU Cooling Fans by Noctua

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Enhance your purchase

Item Dimensions LxWxH 3.62 x 4.49 x 1.46 inches
Brand Noctua
Voltage 12 Volts
Wattage 2.52 watts
Compatible Devices Desktop
Noise Level 15 dB

About this item

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  • Only 37mm total height, ideal for slim HTPC cases and Small Form Factor (SFF) builds
  • Compact footprint for 100% RAM and PCIe compatibility on ITX motherboards as well as easy access to near-socket connectors
  • Quiet, premium-grade NF-A9x14 fan with Low-Noise Adaptor and automatic speed control via PWM
  • Includes award-winning NT-H1 thermal compound and easy-to-install SecuFirm2 mounting system for the AM4 socket of AMD’s Ryzen CPUs and APUs
  • Renowned Noctua quality backed up by 6-year manufacturer’s warranty, deluxe choice for AMD Ryzen CPUs & APUs with moderate heat load (e.g. 5600X, 4750G, 4650G, 3700X, see compatibility list)
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  • Noctua NH-L9a-AM4, Premium Low-Profile CPU Cooler for AMD AM4 (Brown)
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Product Description

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The NH-L9a-AM4 is the latest, AM4-specific revision of Noctua’s award-winning NH-L9a low-profile CPU cooler for AMD Ryzen-based HTPCs and Small Form Factor (SFF) systems. At a height of only 37mm, the NH-L9a is ideal for extremely slim cases and, due to its small footprint, it provides 100% RAM and PCIe compatibility as well as easy access to near-socket connectors even on tightly packed mini-ITX motherboards. The custom-designed SecuFirm2 mounting system for the AM4 socket makes installation child’s play and, thanks to the highly optimised NF-A9x14 92mm fan that supports fully automatic speed control via PWM, the NH-L9a-AM4 runs remarkably quietly. Topped off with Noctua’s renowned NT-H1 thermal compound, the NH-L9a-AM4 combines everything users have come to expect from Noctua’s larger coolers into a super-compact, premium-quality package for ITX and HTPC builds with Ryzen CPUs or APUs.

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NH-L9i NH-L9a-AM4 NH-L9i chromax.black NH-L9a-AM4 chromax.black
LGA2066 X X X X
LGA2011-0 & LGA2011-3 X X X X
LGA115x (LGA1150, LGA1151, LGA1155, LGA1156) X X
LGA1366 X X X X
LGA775 X X X X
AM2(+), AM3(+), FM1, FM2 (+) X X X X
AM4 with NM-AM4-L9aL9i with NM-AM4-L9aL9i
TR4 & SP3 X X X X

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Customer Rating 4.8 out of 5 stars (1804) 4.8 out of 5 stars (865) 4.8 out of 5 stars (2422) 4.7 out of 5 stars (831) 4.7 out of 5 stars (476)
Price $44.95 $54.95 $44.95 $54.95 $44.99
Shipping FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details FREE Shipping. Details
Sold By Noctua Cooling Solutions Noctua Cooling Solutions Noctua Cooling Solutions Noctua Cooling Solutions Scythe Inc
Item Dimensions 3.62 x 4.49 x 1.46 inches 3.62 x 4.49 x 0.91 inches 3.74 x 1.46 x 3.74 inches 3.74 x 3.74 x 1.46 inches
Item Weight 1.03 lbs 1.03 lbs 0.92 lbs 0.84 lbs 1.05 lbs

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4.8 out of 5 stars
4.8 out of 5
1,804 global ratings
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Top reviews from the United States

Reviewed in the United States on August 17, 2019
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5.0 out of 5 stars Keeps up with my 3400G + Deskmini A300W
By Jon A. on August 17, 2019
After a week with the stock ASRock cooler on my Ryzen 3400G in an ASRock Deskmini A300W, I was a little tired of the rather audible fan noise so I ordered one of these. The install was easy enough but a little fiddly since you have to install pieces on both sides of the motherboard at once, with thermal compound possibly sliding around. But I got it on with minimal sliding.

Under CPU stress test, the package temperature sites around 75C. I'd been lead to believe from other reviews that I should expect closer to 60C. But 75C sounds like it's cool enough to be fine. It runs 55-60C in typical gaming and 35-45C when browsing the web and watching video. Some day I will take the cooler off and check + redo my thermal compound layer to see if it can run cooler.

I wouldn't call it "nearly silent" but it is definitely quieter than stock. With it sitting just to my right on my desk I can't hear it unless the room is nearly silent. Any music, video game, talking, or the house's A/C running and the cooler is below the environmental noise most of the time. When gaming it's barely audible with normal game audio, which is a big improvement over the stock cooler which could drown out faint game sounds.

I'd personally prefer stealthy black rather than the distinctive Noctua color but shrug.

I was hoping for slightly better cooling than I'm seeing but it's a good compromise cooler.

Update: Been running it over a month now with no thermal issues at all. Never notice the fan noise at all. My MacBook Pro is a lot louder than this.
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29 people found this helpful
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Reviewed in the United States on February 17, 2019
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31 people found this helpful
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Reviewed in the United States on March 25, 2018
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20 people found this helpful
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Reviewed in the United States on November 18, 2019
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10 people found this helpful
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Reviewed in the United States on April 9, 2018
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Top reviews from other countries

sidneylopsides
5.0 out of 5 stars Great quality, silent, but fiddly to fit.
Reviewed in the United Kingdom on May 7, 2018
Verified Purchase
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5.0 out of 5 stars Great quality, silent, but fiddly to fit.
Reviewed in the United Kingdom on May 7, 2018
Comes in a very nicely presented box, with a metal case badge, cable to reduce speed, tube of thermal paste, rear mount plate and extra screws in case you want to replace the stock fan with a thicker one.
Very weighty and well machined, it all seems very good quality.
I fitted this to a Ryzen 3 2200g on an AsRock AB350 Gaming ITX motherboard. It was a little awkward as you have to screw the heatsink on from the underside, while holding it in place and keeping aligned. It's very well mounted though.

Most temps seem similar to stock, but with much lower noise. I was always aware of the Wraith Stealth fan whereas in the same situations this is silent. When pushed the fan is louder but still acceptable, and quieter than the Stealth. With a GPU overclock to 1500MHz and gaming on GTA Online the fan seems to get to about 80% speed, so probably has a bit more potential.

I'm using this is a very compact case with restricted airflow so my temps are higher than average, hitting about 80C in games that push the 2200g.
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14 people found this helpful
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carefulbuyer
5.0 out of 5 stars The Perfect Cooler for my ASROCK Desk Mini A300
Reviewed in the United Kingdom on January 27, 2020
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4 people found this helpful
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Dee Bristol
3.0 out of 5 stars Not good with 3600 Ryzen 5
Reviewed in the United Kingdom on June 13, 2020
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4 people found this helpful
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J. Richards
4.0 out of 5 stars Usual Noctua quality
Reviewed in the United Kingdom on April 5, 2019
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4 people found this helpful
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Graham B.
5.0 out of 5 stars Great upgrade from the stock cooler - Perfect for living room PCs!
Reviewed in the United Kingdom on January 4, 2020
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3 people found this helpful
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