The ARCTIC Liquid Freezer III Pro 420 A-RGB is a high-performance all-in-one liquid CPU cooler designed for powerful gaming PCs, enthusiast systems and demanding workloads. Its large 420mm radiator provides an extensive cooling surface for effective heat dissipation. Three 140mm P14 Pro A-RGB fans provide strong airflow through the radiator, with speeds from 400 to 2500 RPM and PWM control for automatic fan speed adjustment. The fans deliver up to 110 CFM airflow and 5.2 mmH2O static pressure for efficient cooling performance. An integrated VRM fan provides additional airflow around the CPU voltage regulation area, helping to cool components around the processor during demanding workloads. The pump operates from 800 to 2800 RPM and uses a copper cold plate with micro-skived fins for efficient heat transfer. The 420mm aluminium radiator measures 458 x 138 x 38mm, while the 500mm reinforced EPDM tubing provides flexibility when positioning the cooler inside a compatible case. MX-6 thermal compound is included, and the cooler uses PWM control for the pump, radiator fans and VRM fan. The Liquid Freezer III Pro 420 A-RGB features customisable A-RGB lighting and is compatible with Intel LGA1851 and LGA1700 as well as AMD AM5 and AM4 processors. With its White design, large radiator and high-performance cooling configuration, it is well suited to high-performance PC builds.