Ever since it was founded back in 2004, NZXT has been focused on the always-lucrative PC gaming market. The company started out with just a few PC cases, yet their unique aesthetics and features were more than enough to let the company establish a solid foothold in the advanced PC market. Several years later, NZXT slowly began diversifying their product portfolio by adding cooling and power products to it. Today, the company produces a large variety of PC cases, cooling, and power products, as well as PC peripherals and accessories.

NZXT entered the PC cooling market nearly a decade ago by releasing all-in-one (AIO) liquid cooling solutions and accessories for them, including GPU mounting brackets. However unlike other manufacturers who have opted to build large, diverse product lineups, NZXT never kept more than a handful of AIO coolers available in their product line-up. Instead, the company has focused on delivering a few quality and aesthetically-unique designs, rather than trying to take the competition down on raw performance alone.

Today we are taking a look at NZXT’s latest liquid coolers, the Kraken X-3 and Z-3 series. These are more of a refresh rather a total upgrade over last year’s X-2 series, but NZXT has made some notable tweaks. Between the two families there are five different coolers in three sizes, covering the usual 240/280/360mm configurations. Both the X and Z series utilize the same cooling hardware, but NZXT has positioned the Z series as a premium option with a novel aesthetic feature – while the X series has RGB lighting on top of the pump base, the Z series tops its base with a full-fledged (and full color) LCD screen.

For this review we're checking out both the X73 and the Z63, giving us a full view of the performance and features we can expect from most coolers that NZXT currently offers. 

NZXT Kraken Z-3 and X-3 Series
Fan Configuration X Series Z Series

2x 120 mm

X53 ($130)


2x 140 mm

X63 ($150)

Z63 ($250)

3x 120 mm

X73 ($180)

Z73 ($280)


Packaging & Bundle

The new Kraken Z-3 and X-3 coolers ship in relatively simple packaging, based on the same white/purple artistic theme that NZXT has used over the last few years. A picture of the cooler covers the otherwise plain front of the packaging. Inside the box we found the coolers and their parts well protected by custom cardboard inserts.

All of the coolers share practically the same bundle, which is limited to the basics. Inside the box we only found the required mounting hardware, the necessary wiring, and an installation manual. We should also note that NZXT does not include the TR4 socket mounting plate by default, but they do have one available as an optional part for Threadripper owners.

The NZXT Z63 and X73 come with two 140 mm and three 120 mm fans respectively. The company went with high quality fans, with fluid dynamic bearing (FDB) engines and anti-vibration mounting pads. They are not overly powerful, though with their flat-bladed, high-pressure design they shouldn't have much trouble overcoming the resistance of the radiator. There is no lighting about the fans, with the company focusing their artistic enhancement efforts on the pump block instead.

The NZXT Z63 & X73 AIO Coolers

Digging into our review samples, let's start with deciphering NZXT’s cooler names. The first character denotes the series, the second the size, and the third is the version. For example, the Z63 and the Z73 coolers belong to the same series and share most features but their radiator size differs, while the X73 and Z73 are of the same size but belong to different series. Thus the Z63 and the X73 that we will be reviewing today check both of these boxes, allowing us to explore the differences between the Z and X series and measure the thermal performance of both the 280 mm and the 360 mm coolers.

So what sets apart NZXT's X and Z series coolers? In short, it's all about displays. For the Z series, NZXT has topped off the the main block assembly with a 2.36” LCD screen. The LCD can be programmed to showcase everything from images and GIFs to real-time data. And despite the low 320×320 px resolution, it is crisp and bright, with beautiful color reproduction.


Otherwise for the X model, NZXT dials things back just a tad and uses a mirrored top with LEDs placed under it. Once powered, the company logo and a ring appear, with the mirror creating an infinity effect about the ring. The LEDs are RGB and users can adjust the colors of the ring using NZXT’s CAM software. On the whole it is a relatively simple and attractive visual setup.


Other than the display topping the main block, the X and Z series coolers are all but identical. The rest of the main block is the same between the two, going right down to the contact plate and mini pumps. So at the base of NZXT's LCD and LED handiwork lies a circular copper plate, secured on the plastic body with eight stainless steel screws. A layer of thermal paste is pre-applied onto the contact plate. It is not machined down to a mirror finish but it is smooth and entirely flat. The contact plate is not large enough to cover Ryzen Threadripper processors and, although it should work okay, we generally advise against using coolers that are not specifically developed for the TR4 socket on Threadripper processors.


Moving on, let's talk about NZXT's radiators. Their different sizes aside, the radiators of both the Z63 and X73 seem to be identical in terms of design. The subtle but significant difference is that the 120 mm fan radiator of the X73/Z73 is 26 mm thick, while the 140 mm fan radiator of the Z63/X63 is 30 mm thick. It's just a few millimeters, but it's something that should absolutely be considered confirming the cooler’s compatibility with a given case, as sometimes a few millimeters makes all the difference. Both radiators are typical dual-pass cross-flow designs, with tiny fins soldered on thin oblong tubes. This is by far the most dominant radiator design for AIO systems and rightfully so, as it offers the best efficiency within limited proportions and for the temperature differences that AIO coolers have to deal with.

The hose fixings on the radiator side are immovable, making them a bit less flexible during installation. In order to cope with long-term evaporation losses, NZXT is using what they are calling “ultra-low evaporation” high-density rubber tubing, with external nylon sleeve braiding for additional mechanical protection. NZXT also took the time to punch the company logo on the sides of the radiators.

The NZXT CAM Software
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  • whatthe123 - Wednesday, August 19, 2020 - link

    arctic and EK have released non-asetek coolers recently and both of them outperform practically every asetek cooler on the market, especially in price. I don't think asetek rebrands are the only choice anymore as long as you can get your hands on a freezer 2 or ek drgb.
  • edzieba - Thursday, August 20, 2020 - link

    In the US, Asetek swings their legal muscle around to quash competition. Elsewhere in the world, there are plenty of other AIO designs available.
  • jaggedcow - Wednesday, August 19, 2020 - link

    Minor point but I found it odd how they were dinged for not including threadripper mounting then in the next paragraph the reviewer says it’s not designed for threadripper‘s die size and that they wouldn’t recommend using it with a threadripper CPU. So why are we dinging NZXT for not including mounting hardware for a CPU that this cooler isn’t designed for and a configuration that the reviewer themselves doesn’t recommend? If anything, including a TR4 mount would imply that it WAS designed to also cool that chip.
  • Ryan Smith - Wednesday, August 19, 2020 - link

    "So why are we dinging NZXT"

    To be sure, NZXT is not being dinged. We're just noting that while NZXT advertises these coolers as being able to work with Threadripper, they don't do so out of the box. (And even if they did have the part in the box, we wouldn't suggest it)
  • Machinus - Wednesday, August 19, 2020 - link

    Ian, can you ebalorate on how usable the X73 is without having to use the CAM software? Can the fan and pump be controlled with typical BIOS headers?
  • satai - Wednesday, August 19, 2020 - link

    Is it better then high end air coolers?
  • inighthawki - Wednesday, August 19, 2020 - link

    The 360mm and 280mm radiator coolers tend to be give or take with high end air coolers, and generally cost more. The 240mm radiators are almost always worse, more expensive, and louder.

    The largest advantage of these is often not the improved temps, but how they mount in the case. The higher end air coolers tend to be extremely bulky and can have some difficulties fitting in smaller or more compact cases, or can have compatibility issues with ram depending on the ram height and motherboard layout.
  • Luminar - Wednesday, August 19, 2020 - link

    Repeat after me: all water cooling solutions eventually leak.
  • Lord of the Bored - Wednesday, August 19, 2020 - link

    [citation needed]
  • Spunjji - Thursday, August 20, 2020 - link

    On a long enough timescale? Sure.

    Within the lifetime of one or even two system builds? No, not in my experience.

    Can't comment for longer durations than that, as the oldest kit I've personally seen in service is about 7 years old now.

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