We all know that EK Water Blocks produces some cracking custom liquid cooling products, but the company has had a slightly chequered history when it comes to its all-in-one liquid cooling solutions. No one can deny that the original EK Predator expandable AIO had excellent thermal performance, but leaking CPU blocks due to faulty rubber O-rings blighted the Predator series before it really got going. EK addressed these problems with its Phoenix modular AIO series, but it was never technically in the same class as a traditional closed-loop AIO.