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Item#: N82E16835146027

NZXT Kraken X40 RL-KRX40-01 Ultra Performance Water/Liquid CPU Cooler 140MM

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  • 800 - 2000 RPM +/-10% 54 - 98.3 CFM
  • Radiator Dim. 138.4 x 27.0 x 172.5mm
  • Fan Dim. 140 x 140 x 25mm
  • Fan Noise 21 - 37 dBA

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Step up to the NZXT Kraken X40 cooling solution for powerful yet silent liquid cooling performance. This all-in-one water cooling solution comes complete with everything, including 1x NZXT FX-140 PWM fan, a superior pump attached to a copper base and extra-long 16” tubing. Either novice or experienced users can get this unit up and running in minutes, without the hassle of coolant filling. And together with the quality and reliability NZXT are known for, the NZXT Kraken X40 lives up to all the expectation of hardware enthusiasts and DIY professionals.


  • newegg 140MM Fan The pre-installed 140mm fan delivers efficient and effective system cooling, with capacity to mount up to an extra 140mm fan for enhanced cooling.
  • newegg Superior Pump with Copper Base High quality pump enables longer life span and noiseless operation. The copper base delivers high efficiency heat thermal conductivity and eliminates heat surge.
  • newegg Easy Installation 16" tubing allows hassle-free installation in large tower case, and premium black sleeved cables allow a clean look and improved airflow.

Learn more about the NZXT RL-KRX40-01

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the NZXT RL-KRX40-01

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  • Anonymous
  • 9/30/2014 12:09:41 PM
  • Ownership: more than 1 year

1 out of 5 eggsTerrible Service from NZXT

Pros: Quiet.

Cons: I have joined Newegg to warn other customers about NZXT products. Not something I normally do.

The company lie about case compatibility. Their head of Tech Support (Eric Henry) has stated in an email to me they do not test these on any cases but their own. This makes their compatibility list totally false as I found out a few weeks back.

I have a Corsair Carbide 500R and their compat guide states rear placement. Their head of tech stated in an email to me he had the case in front of him, and it fits fine. It took me sending him a video and photos to admit he had 'got it wrong' and that it doesnt fit. They have offered no compensation, and advised me to chop my case up to make it fit.

Disgusting customer service, and would most definitely never buy NZXT products again.

Other Thoughts: Customer service from NZXT is completely abismall. I would not recommend any of their products based on this experience. Being told to cut up a case that is worth more than the cooler itself is an outrageous statement to make, especially from the head of tech support for the company.

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

3 out of 5 eggsOutstanding performance, faulty USB connections

Pros: CPU:
Kept my i5-2500K OC'd to 5GHz under 70°C during stress testing.

With the NZXT Kraken G10 bracket it keeps my MSI GTX 780 Gaming OC under 50°C at full load even when overclocking. Control panel is very simple, yet provides full control of the cooler.

Cons: Fan has a very annoying motor whine above 30% fan speed. Not high pitched but very annoying none the less. USB connection caused BSODs after 8 months of use.

Other Thoughts: After about 8 months I started getting BSODs. I changed boards, memory, graphics cards, SSDs and HDDs. I even reinstalled Windows 3 times and the BSODs continued. I finally unplugged the Kraken X40 USB cable and the BSODs stopped. I plugged it back in and the BSODs returned. It's unfortunate because this cooler does an amazing job, but the problems it caused are unacceptable.

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  • Alvin L.
  • 6/25/2014 10:25:35 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsChilling out

Pros: Does what it is made to do.

Cons: None. although when I bought it NZXT announced that it was releasing the Kraken X41 the following day! I would have bought that had I just waited 1 more day.

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  • Blake W.
  • 6/19/2014 6:39:57 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsCold as Ice

Pros: I recently built a new system and my i7-4770k was idling at 140 F! After reading over my available options I went with this cooler because NZXT makes my case and I have been happy with it.

My machine was already built, so installation was as simple as removing my current heatsink and installing this one.

After installation my machine idles at 90 F and I couldn't be happier.

Cons: Like others have mentioned the fan can be loud when it runs at max. However, my system has yet to push the fan to max, even when I play FFXIV on on maximum settings.

Other Thoughts: My Asus Maximus VII required some BIOS modification before the system would boot without a "CPU Fan Error." I had to tell board to ignore cpu fan speed.

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

  • Albert C.
  • 6/11/2014 12:55:40 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat, but wait for revision

Pros: Amazing cooler. Replaced my 3 year old Antec Kuhler 920 and its even better then my old one.
Got another fan exactly the same for push pull, playing games like WoW and its sits at 29c very nice improvement from a 120mm.

Cons: Make sure you have enough clearance, i had to loosen the screws and push it toward motherboard and tighten them so the side panel would close correctly.

Removed thermal paste and use my IC Diamond.

Other Thoughts: Computex 2014 just announced new X41 and X61. Thicker rad, pump, etc everything brand new and upgraded, except the tubes, but it will be a big difference.

Only regret is getting this before knowing a new version is coming soon.

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  • Edmund H.
  • 3/26/2014 10:29:02 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsThe Preferred AIO Cooler

Pros: Pretty much fell in love with this thing when I first saw it. The NZXT logo LED is way better looking than the Corsair one, in my opinion. Official reviews showed that this cooler outperforms most of the Corsair ones as well.

With the stock fan installed and with the Extreme profile selected in the software, this thing is a seriously good cooler. I put it in a Node 304 and it kept my 4.1 GHz 3570K at around 35-40 idle, and never above 65 at full load.

The tubes are pretty long. I love the idea of putting this radiator at the intake side so you guarantee it is getting cold air. The tubes are long enough to do so in a larger case. See cons also tube cons also.

Cons: I originally bought two Phanteks fans for push/pull with this. I eventually tried the stock fan in pull config. This fan is definitely too loud. Even at the "silent" setting there is a somewhat annoying whir. At extreme it is like what the other guy says, a jet engine starting up.

I would definitely recommend getting a different high rpm/quieter fan, it will still perform well. Pull config will suffice.

Another thing that was a con for me, but not worth taking another egg off, was that the tubes were too long. I had to pretty much squish them into my case.

Other Thoughts: This was my first Newegg review and first AIO cooler. I would have given this 3 stars due to the noise, but I just liked the looks of this thing too much. Ended up deciding I didn't like water cooling so I replaced this with an air cooler which is turning out awesome.

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

  • Anonymous
  • 3/4/2014 4:00:18 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsVery good!

Pros: Keeps a big i-4820k cool. Really cool actually- house ambient temp 68F, idling CPU temp only 75F; or 28.5 C. Under max load does not hit 50 C.
nice sleeving on all connectors including the PWM fan.

Cons: The PWM fan that comes with this cooler can get pretty loud. A little tweaking brings it down to a dull roar. Not much of a con, really, as nearly all of the AIO water cooling units I've tested come with a mediocre fan.

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  • Michael R.
  • 2/25/2014 6:04:18 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsYep, buy it.

Pros: cools great. running a i7 4770K OC'd to 4.2Ghz and it keeps in cool while running BF3/4. i'm sure I can OC higher. fun to customize the fan curve and colors.

Cons: yes, this cooler is a little loud. especially under load. needs USB port on MB, plus fan connector

Did you find this review helpful? Yes No

  • Robert E.
  • 2/23/2014 8:03:50 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat cooler

Pros: Great cooling and quiet! Can dial up cooling capacity with the provided software and the LED can be configured via RBG values for the color you want.

Cons: Not quite a con, but I forgot it was a 140mm cooler when I ordered so some holes had to be drilled in my case.

Other Thoughts: For the price it's a great product and cooling solution.

Did you find this review helpful? Yes No

  • John L.
  • 1/16/2014 12:43:49 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

3 out of 5 eggsFailsauce.

Pros: It actually did a fantastic job at keeping my system cool. Right around 32-35C on normal usage.

Cons: Failed around 7 months into usage, the pump seemed to fail, I heard a 'draining' sound, and noticed liquid on my motherboard.

Other Thoughts: I wouldn't be so upset, as I knew this could happen, And I turned everything off fast enough that I don't think it damaged anything else. However, I filed a report on the manufacturer's website 2 days ago, and haven't recieved a response. They have "Live Chat" that always seems to be "offline", and don't have a technical support/RMA phone # to call. Ridiculous support. I have a warranty on the product, so I'll give it 15 days that I'm required to, then go thru other channels, but in the mean time, completely without my desktop computer.

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

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Item#: N82E16835146027
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