Looking for an all-in-one watercooling unit to slap in an open 140mm fan hole? If so, the eTeknix crew has a review of the NZXT Kraken X40 you should check out. You may be wondering - "what is so special about the NZXT Kraken series?". Well that is an easy one to answer. NZXT's Kraken is using a 140mm design, compared to nearly every other all-in-one liquid cooler on the market which uses a 120mm design. What we mean by this is that the NZXT Kraken X40 comes with a 140mm fan and 140mm radiator (the NZXT Kraken X60 comes with two 140mm fans and a 280mm radiator).