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Item#: N82E16835146027

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

  • 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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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


Kraken X40
Liquid Cooling System


Block Compatibility
Intel: LGA 2011, 1366, 1156, 1155, 1150 CPUs
AMD: FM2, FM1, AM3+, AM3, AM2+, AM2 CPUs
Block Material


Radiator Dim.
138.4 x 27.0 x 172.5mm
Radiator Material


Fan Dim.
140 x 140 x 25mm
800 - 2000 RPM +/-10%
Fan Air Flow
54 - 98.3 CFM
Fan Noise
21 - 37 dBA
Fan Connector
4 pin PWM


Tube Dim.
Length : 400mm
Tube Material


World's first all-in-one 140mm cooler with capacity to mount up to two 140mm fans

High performance pump and copper block with interactive digital fan control

Integrated HUE controlled LED pump cap

Large tower support with extended 16" tubing and premium black sleeved cables for a clean look and improved airflow

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the NZXT RL-KRX40-01

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  • Edmund H.
  • 3/26/2014 10:29:02 PM
  • Tech Level: High
  • 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.

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  • Anonymous
  • 3/4/2014 4:00:18 PM
  • Tech Level: Somewhat High
  • 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
  • Tech Level: Somewhat High
  • 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

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  • Allen E.
  • 2/23/2014 8:03:50 PM
  • Tech Level: Somewhat High
  • 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.

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  • John L.
  • 1/16/2014 12:43:49 PM
  • Tech Level: High
  • 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.

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

  • Eric O.
  • 1/13/2014 8:02:31 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsKraken x40

Pros: Keeps the 8350 @ 4.4GHz and 1.4 volts nice and cool- 20C idle and 55C full load over 15 mins w/ Prime 95. R9 290x w/ G10 bracket and heatsinks on the VRAM @ 50C full load. (Arctic 5 for both)

Nice unit. X60 seems overkill. Of course, the above temps depend on the custom settings I have w/ the Kraken control. Better temps are a definite, if you can stand a little noise.

Cons: I hear one of the fans make a knocking sound every so often. It's not really that loud or anything and not too often.

Installation is not hard, but some things are not stated in the instructions. First of all- you will need to remover the old, stock setup. Four screws taken out, around the CPU and you're in business to start following NZXT instructions.

Both of my units, and from what I understand, all AIO coolers, have an air bubble in them. Can't be helped? I don't know, but be sure to install the radiator /above/ the pump for best performance.

Other Thoughts: Fits fine in top and back of Rosewill Thor V2 case, just use the holes closest to the open side, to keep the radiator away from the motherboard.

Happy overclocking :)

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  • Kevin K.
  • 12/29/2013 5:58:31 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsLooking good and working well.

Pros: Keeps my i5-3570k cool in the mid 20's during idle and in game to about 45C. The software included works and is easy to use. The LED feature is a nice touch.

Cons: I have the NZXT Phantom full tower case and I thought that maybe using a fan adapter I would be able to fit on despite what other's say about this case and cooler. I was able to fit it in my case using a fan adapter and slight case modding. I connected the 120mm to 14omm fan adapter to the 120mm fan included in the case and the other end connected to the 140mm radiator. From there, I attached the 140mm fan that the cooler comes with the other side of the radiator. I was able to fit all of that in the back exhaust mount on the Phantom by simply bending a little bit with pliers where the radiator hit the top of the case where the side panel would slide on. That may seem confusing but let's just say it is possible to fit this in a Phantom with a little bending and one 120-140mm fan adapter. The con with this product is that it should be compatible with the cases NZXT makes. It can be done, however, as described above.

Other Thoughts: I have not overclocked yet but I will by the time I update this review in a few months. Then I will post whether or not it cools a CPU well under load, assuming it will work just as it does now for the next few months.

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  • Paul S.
  • 11/29/2013 11:45:06 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

2 out of 5 eggsI have owned this product since Jan and..

Pros: It is a very efficient water cooler for the time that it works well. Install wasn't as bad as a lot of other reviews were saying.

Cons: Ok first off I installed it onto a Thermaltake Spedo Advance case fit fine. You want to have a big case for this block. Seriously it is big. Now, one bad thing is that the one in my case right now is dying. The first one that I had died after about a week. The pump started making a nasty rattling noise. Kept on doing it while keeping the CPU at 30c and no issue of cooling. Yeah it was working fine. This one is doing the exact same thing after 7 months but unfortunately whats happening is the CPU is starting to jump up to about 45c to 65c and sometimes my system will just reboot on its own now.

Other Thoughts: Its a good system while it works I am not going to RMA it I am just going to junk it for a corsair 80i. I recommend if you start hearing a rattle or anything from it start paying attention to your computer.

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  • Anonymous
  • 11/21/2013 1:31:51 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week


Pros: looks good on paper, easy installation, braided cables.

Cons: I installed this cooler to the 140mm fan holes in the back of my case,
I then attached the heatsink to my CPU. Next, I plugged in the 3 pin power cable into my 4pin cpu power header.
I went to turn on computer and PUFF!!!! My brand new motherboard is up in smoke. I then rippd out the power cable to prevent further damage. upon closer inspection I noticed that the traces from my cpu fan header are TOTALLY FRIED!. My computer will not turn on now. They knew exactly what happend when I emailed them, this has happened before!!! PLEASE BE CAREFUL WHEN INSTALLING ONE OF THESE COOLERS. It could kill your motherboard and unless you have the funds you will be out of a computer like me. Sorry for the unorginized writing but I am so upset right now.

Other Thoughts: I am trying to get a response from NZXT. THey said I had to send the motherboard and cooler in to them and it could take up to a month for a replacement. WOW! I even have extremely detailed pictures showing exactly what damage occured. Its right next to the NZXT krakken fan plug whch is plugged into my CPU fan Header.
i have done everything perfectly, instaling a brand new cooler onto a brand new motherboard and this is the result.
I ordered the cooler from 'zon and the motherboard from newegg. 'zon is SO great about returns, my new cooler is already in the mail and should be here tomorow. BUT..... I ordered the MOBO on newegg and they want to charge me to send it back! I can't figure out what I'm supposed to do here?

Manufacturer Response:

Dear Valued NZXT Customer,

First we would like to apologize for the inconvenient we caused you using our product. We fully understand your situation and we are definitely here to assist you with your issue and any sort of reimbursement for your motherboard if necessary. But before proceeding with this we will need to retrieve the damaged components physically and do a series of testing and evaluation. We will still offer you all the necesssary services that you will need from us and please feel free to contact our support center anytime. We appreciate your patience and continued support with NZXT!

Best Regards,
NZXT Support.

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

  • SeiRruf M.
  • 11/19/2013 3:43:35 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsColorful Cool Greatness

Pros: Works. It's Quiet, it runs smooth and just so wonderful. I mounted an additional 140mm fan on mine and it doesn't even run warm, it keeps so cool. It also has the features to change the color of the NZXT logo over the CPU mount. :) You need an additional on board USB header however.

Cons: None at all! Just keep in mind that this thing is a bit sizey to hold the 140mm fan, It may not fit in your case, so do your research! It also takes an additional on-board USB pin mount for the custom colors, so be ready for that as well.

Other Thoughts: This is amazing, I especially love the fact that I can change the color of the cooling CPU mount :) My CPU runs so nice and cool, never had a problem with it at all/

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Water / Liquid Cooling > 
Item#: N82E16835146027
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