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The similarities between the NZXT Kraken X40 and the Corsair H90 are extensive, as the same basic design is shared between the two. There are a couple of differences here and there which will attract different buyers however. Unlike the larger X60, the X40 is widely compatible and isn't restricted by the lack of industry fan spacings.
Here is a list put together by NZXT, highlighting case compatibility. As you can see there are plenty of cases on offer which provide support for the 140 mm X40.
The Kraken X40 shares it's CPU block design with the Corsair H90 as they are both based on an Asetek design. This features a large circular copper contact plate with screws all the way around. The thermal paste is pre-applied to the block to ensure the easiest possible installation procedure.
One way in which the X60 differs from the H110 is that it features LED-lighting in the pump cap. This can be configured through a software application which is supplied on a CD with the cooler. We will take a closer look at the software later in the review.
The CPU block is connected to the radiator using two flexible rubber tubes which are thick and feel durable. These are preferable to the more rigid FEP tubes which are found on other all-in-one liquid coolers such as the Cooler Master Seidon 120M.
One of the main differentiating factors between the X40 and the H90 is the fan bundled with the unit. The X40 features a two-tone black and white fan which is PWM controlled, spinning at a maximum of 2000 RPM. This is notably faster than the Corsair H90 fan which can only spin up to 1500 RPM.
