The ARCTIC Liquid Freezer III Pro 420 A-RGB is an all-in-one CPU water cooler for builders fitting a high-capacity cooling system to a compatible PC. Its 420 mm radiator and three fans make it suited to systems where effective heat transfer and addressable lighting are both priorities.

The cooler combines a copper cold plate with a PWM-controlled pump and three P14 Pro A-RGB radiator fans. An integrated VRM fan provides additional airflow around the motherboard’s voltage regulators. The radiator fan cables are integrated into the hose sleeving to keep installation wiring tidier, while the offset mounting design moves the cold plate towards the CPU hotspot. A-RGB lighting is fitted to the fans and pump area.

Key features

• 420 mm aluminium radiator measuring 458 x 138 x 38 mm
• Copper cold plate with micro-skived fins
• PWM-controlled pump operating from 800 to 2800 rpm
• Three P14 Pro A-RGB fans with speeds from 400 to 2500 rpm
• Integrated VRM fan operates from 400 to 2500 rpm
• Fan airflow is rated at 110 cfm or 186 m³/h
• Addressable RGB connector uses a 3-pin plug

Compatibility

Compatible with Intel LGA1851 and LGA1700, and AMD AM5 and AM4 sockets. Check that your case supports the radiator’s dimensions and allows room for the cooler’s installation; ARCTIC specifies at least 63 mm of mounting clearance. The fans use a 4-pin fan plug and the lighting uses a 3-pin A-RGB plug, so check for suitable motherboard headers before buying. Good to know: this cooler does not support Intel LGA1200 or older sockets without a separate mounting kit.

In the box

• ARCTIC Liquid Freezer III Pro 420 A-RGB

Specifications

For a build with compatible socket and case clearance, the Liquid Freezer III Pro 420 A-RGB brings a substantial radiator, integrated VRM airflow and configurable lighting together in one cooling unit.