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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


Liquid Cooling System


Block Compatibility
Intel LGA 2011-3, 1366, 1156, 1155, 1150 CPUs
AMD FM2, FM1, AM3+, AM3, AM2+, AM2 CPUs


Fan Dim.
800-2000 RPM ± 10%
Fan Air Flow
81.32 CFM (max.)
Fan Noise
18-34 dBA
Fan Connector
4 Pin


Tube Dim.


Fan Bearing: Hydro Dynamic Bearing
Motor Connector: 3-Pin

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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  • 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.

Did you find this review helpful? 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!

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  • 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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Computer Hardware > 
Fans & PC Cooling > 
Water / Liquid Cooling > 
Item#: N82E16835146043
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