Last week, we had an in-depth look at Antec’s KÜHLER H2O 920. We concluded that despite the good performance, it was let down by its noise and reliance on high RPM fans to achieve its full potential. On the whole, it still proved to be an improvement over previous all-contained liquid cooling (ALC) units such as the CoolIT Eco and the Corsair H50, not surprising given the thicker radiator of the KÜHLER H2O 920. However, those not convinced by the price of the latter can opt for Antec’s cheaper offering, the KÜHLER H2O 620. This unit is more akin to the like of the Corsair and CoolIT mentioned above, featuring a thinner radiator than the 920 and a single fan. At around half the price of the 920, the 620 is a promising unit that features many of the former’s main advantages such as a compact package that can fit into an system regardless of size, zero-maintenance and leak-proof design, and warranty that covers any faults.