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NZXT Kraken X40 Review

Rating: 8.0.

Today we are going to take a look at the Kraken X40, which is one of NZXT’s first attempts at a performance liquid cooler.  It is a similar design to the X60, however it features a smaller 140 mm radiator for those who don’t have room for a 280 mm unit in their case.  We look forward to seeing how it performs in our tests.

Like the Kraken X60, the X40 is based on Asetek technology, making it similar to the Corsair H90.  We will be looking at the differences between the two coolers in this review, highlighting the advantages and disadvantages of each.

We will also look at how it compares to the Kraken X60 and Corsair H110, to show how the larger radiator affects performance.  The 140 mm radiator differentiates the X40 from the competition as it has more surface area than the myriad of 120 mm coolers on the market.


  • 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.
  • Completed sealed system backed by a 2 year warranty.

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  • Davis

    Great looking cooler. They seem to be bringing out a lot of nice cases too.

  • Eran

    I bought this last week and its brilliant. great value and handles my 3770k at 4.8ghz under 70c load.

  • Optical Illusion

    close battle with Corsair with this one.

  • Mike Morris

    Unfortunately the NZXT compat guide is totally false. The systems listed, majority of them are not actually compatible. For example, the Corsair Carbide 500R. The guide will state rear compatibility, which is entirely not the case. There is no functional way for rear placement. As for top placement, there is barely enough room, but it works just about. Impossible for any push/pull config however.

    When contacting NZXT about this, I was referred to Eric Henry the Tech Manager. He stated and I quote:
    “We have the same case, here and I have tested it on it before responding to your email”.

    I have had to make a video and take photos to prove he is lying and it doesnt fit. When called out on this, he said he must have made a mistake. Total and utter rubbish.

    My warning to people, go with something that you know is going to fit. Buy something that is made by your case manufactor or is 12cm in size for a more guaranteed rear placement setup, because if you base your purchase off of their guide, they will pretty much tell you to bugger off, cut your own case up, and bother someone else.

    As for product functionality itself, it works, so I guess thats a good part, just a shame I can’t return it for a refund and buy something that is compatible and has decent customer service.