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Item#: N82E16835146043

NZXT Kraken X31 120mm Closed Loop Liquid Cooler

  • 800-2000 RPM ± 10% 81.32 CFM (max.)
  • Fan Dim. 120x120x25mm
  • Fan Noise 18-34 dBA
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Learn more about the NZXT RL-KRX31-01

Quick Info


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

Customer Reviews of the NZXT RL-KRX31-01

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  • Jorge G.
  • 2/2/2015 1:34:46 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

4 out of 5 eggswoks just great no issues here.

Pros: easy and simple to install. keeps my i3 temperatures below average (compared to the OEM heat sink and fan). overall recommended. not too loud.

Cons: doesn't have any lights on it. instructions suck, but does have animated online instructions. for the price tho!? meh.

Other Thoughts: if you have a NZXT case with the black and white color scheme, you'll like the way it looks. works like it needs to and stays cool.

Did you find this review helpful? Yes No

  • Jared M.
  • 1/7/2015 1:42:53 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsSolid

Pros: Inexpensive liquid cooling solution
Good little unit so far
Easy Ish to install

Cons: CAM doesn't like AMD processors. But it's more accurate than many programs I've tried the past month.

Thermal Compound dried up within 5 weeks of hooking it up to the AMD A10-5800K Processor I got it, and actually began to cook it. Had the temp crested at 80c a couple times, but she never even seemed to notice.

I put some Tri-Linear Ceramic thermal compound on tonight and I already see a big change

Other Thoughts: I picked up a tube of Arctic Silver CMQ2-25G Céramique 2 Tri-Linear Ceramic Thermal Compound (Sold here at Newegg) during the build, not knowing if I'd need it. Turns out both the Processor and the Liquid cooler had it pre-applied.

I just figured out tonight, after some testing, that the compound that came on my NZXT cooler was already dried out completely to the processor and on the cooling block. I applied some of the compound and its looking better already.

When you get yours, PLEASE replace the thermal compound to protect your CPU/APU. The quality just wasn't there.

As far as installation, I'd prefer install instructions be fully disclosed in the box, rather than needing a PC to follow the instructions (Because I'm trying to BUILD one)

For intel users, You should be set with the pre-installed brackets, AMD users have to kinda work for it. There are 2 intel brackets by the way.. Watch yourself. If you have an Intel processor that doesn't fit the bracket pre-installed to the unit, get ready to work like the AMD users do to get it installed.

Took me about 45 minutes to install for a first-time computer builder. And 5 to replace the compound a month later.

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  • 3179 P.
  • 10/16/2014 7:13:21 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsnice aio

Pros: quiet.
easy to install
worked on the first try

Cons: none.

Other Thoughts: This was my first aftermarket cooling solution ever used. Had to replace noisy stock AMD FX-8320 cooler.

Did you find this review helpful? Yes No

  • Frank J.
  • 9/23/2014 7:25:43 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsWaste of Money

Pros: Quiet and not too difficult to install.

Cons: No Manual and no iDevice support on website for manual (make sure you have another PC available to help with the install)
Poor tech support (FAQs are limited)
Make sure you have the original AMD fan bracket otherwise you won't be able to do the install

Had the unit a week before it started having problems. It crashed my computer due to overheat twice (I'm not even overclocking) and when I finally get it restarted the CAM software is no longer working and I have a driver issues. I have to uninstall and reinstall the software multiple times to get the computer operational again.

FYI the driver links on their website is broken.

Submitted two tech support requests with no response.

The forums say to install the Antec Cooler software but that didn't work either. I'm just going to chuck it and install my original chip cooler on it. It is louder but at least it works.

Other Thoughts: I saw mixed reviews for the unit but thought it would be a good unit since I was not overclocking. The overall install went well once I got my laptop out to see the installation instructions online. For the first week, I loved it. All temps were stable and it was QUIET! Then it stopped working.

Manufacturer Response:

Hi TheJenks,

We are not quite sure which browser you were currently using, and we have made some huge changes on our main website manual especially for the Kraken series . We would love to hear about your CAM issue on our CAM Feedback as our software engineers will have the answers for you there. You can also contact our support at or contact us directly at 1-800-228-9395 during our business hours. We hope to hear back from you soon.

Best Regards,
NZXT Support.

0 out of 6 people found this review helpful. Did you? Yes No

  • Scott S.
  • 9/7/2014 6:06:49 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

2 out of 5 eggsJunk

Pros: Says NZXT and has a white face that goes with the H440.

Cons: Noisy. Makes a rattle while its running. The white light inside doesn't light up!

Other Thoughts: Does this company even test their stuff before it goes out? This wasted my time and money.

0 out of 12 people found this review helpful. Did you? Yes No

  • Joshua H.
  • 8/17/2014 8:01:48 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsKraken X31

Pros: -Price
-Quiet Pump
-Cam software
-Long tubes

Cons: -Not a huge con but no LED's though I knew this already, NZXT only offers the LED's on their 140/280mm AIO's (ex. x41 and x61)
-Though the Cam software is awesome and helpful you can't really fully control the pump though if you mess around with fan curves and other things it will adjust to the proper RPM

Other Thoughts: I used this on a reference powercolor r9 290 that I bought at the same time with this X31, the white G10 kit, Noctua 92mm fan (replace stock g10 fan) and the GELID heatsinks, and a bitfenix 120mm green LED spectre pwm fan (green theme) and man is it rocking! I did try out the reference cooler just to witness the jet engine noise and within 5 minutes of playing SWTOR it sounded like a hair dryer at full blast. But now with this water cooling setup its SUPER quiet and SUPER cool. My card never goes above 57 degrees now when it use to go to the 90s easily. The pump on the X31 on the first start up makes a lot of noise for a few minutes but than it becomes pretty quiet. Its one of the quietest pumps I've heard, much quieter than any of the coolermasters AIO's. If your looking for a 120mm AIO than you can't go wrong with this one, keeps my 290 cool and would probably keep cpu's super cool as well plus you can't beat the 6 year warranty!

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

  • Alexander F.
  • 8/14/2014 2:36:25 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsI expected better.

Pros: Temperatures
Very long tube length
High quality included fan
Finally a 120mm NZXT AIO
6 Year Warranty

Cons: Severely lacking instructions
Misleading advertising
Not truly variable speed pump
Pump noise is terrible, incessant rattling
CAM Software is a resource hog
CAM Software is nothing revolutionary, redundant and unnecessary

Other Thoughts: I decided to do the G10 modification to my EVGA GTX 780 SC w/ ACX video card. In order to do this, I had to purchase an AIO cooler to go with it. Everyone has such good things to say about the X40/1 and X60/1 AIOs, so I was expecting the X31 to be no different. The reviews that I saw online for the X31 were all positive, so I decided that I would take the plunge on the X31.

Setup onto the G10 is no easy task, and I did require the help of a second person. Anyone who did this by them self needs to be checked for a 3rd arm. Thankfully I did buy this with the G10, because the instructions or lack thereof for the X31 are a complete joke. It is a single page(half page), with almost no words on it, just pictures, with very poor angles. If I was applying this to a CPU, I would surely have to watch a video to help me through it.

Thankfully the G10's instructions are very good, and they use an X40 as the example cooler, which was essential to my success of setting it up.

One of the selling points of the X31 was that it can connect to an internal USB header, which allows you to control the fan speed and pump speed through NZXT's CAM software. While CAM does look aesthetically pleasing, it is not very helpful and is a resource hog. My CPU usage would go as high as 20% for a simple monitoring program. And, to my behest, you cannot control the pump speed! That was the main selling point, variable pump speed control! Not true. You have to hook it up to a fan header on your motherboard if you want that, and the controllable range is only 3000-4000rpm. No matter what speed, it still makes a rattling noise.

Controlling the fan speed is also not as you would expect. There is a massive lag time between changing the fan speed on CAM and it actually happening. It would often display the wrong fan speed. I eventually said screw it, uninstalled CAM and use my fan headers and Fan Xpert II as my source of control.

The X31 performs well, my temperatures are great. They went from 70C on the stock ACX cooler to barely hitting 50C on the core. I am thrilled about that. The G10 is a legitimate option if you add heatsinks to the VRM and VRAM. My X31 has two fans in push/pull at ~60% fan speed so the fans are very quiet, and the included fan is of high quality.

The fans are not the issue though, it is the pump. The pump has a terrible, rattling noise to it. It is very distinctive and extremely annoying. As I type this, the rattling continues.

I did know full and well that I would not be getting LED control with the X31, but I figure I mention it as a con anyways because that is one of the unique options that NZXT brings to their AIOs, but it not here in the X31.

Overall, the temperatures are as good as advertised, this thing does perform exceedingly well. The pump noise and the lack of control are what make me grade this so poorly. I am really disappointed with the CAM software and lack of control.

Manufacturer Response:

Hi there Faceman,

Thank you for the feedback regarding our Kraken x31. Please note that you can always contact our Support team via for any questions you may have about our products. We are available from 9:30-5:30pm PST M-F to answer any inquiries.

Please let us know how we can help!

NZXT. Support

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Item#: N82E16835146043
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