The dual 120 mm Pulse Width Modulation (PWM) fans and 3rd generation copper cold plate ensure quiet, efficient cooling, while the 49 mm thick radiator is equipped to handle the highest performing CPUs on the market. Unlike traditional liquid cooling systems, this self-contained unit comes prefilled and requires zero maintenance. The Antec KÜHLER H2O 920 provides maximum-performance liquid cooling for your CPU in a quick, easy-to-install package.