LIQMAXFLO 420mm A-RGB AIO CPU Liquid Cooler - High Performance Cooling

Our review of the LIQMAXFLO 420mm A-RGB AIO finds it best suited for builders who need aggressive cooling for high-core desktop CPUs and value quiet operation with RGB control. The single biggest reason to consider this cooler is its combination of a thick 38mm 420mm radiator and a high-speed pump that together keep temperatures in check under heavy load while letting the pressured-optimized fans run quietly. Installation can be straightforward for experienced builders, though the size and additional VRM fan add complexity for compact cases.

Key Features

• 420mm 38mm radiator: A large, thick radiator gives extra heat capacity for sustained CPU loads and better temperature control during long stress tests.
• High performance pump up to 3000RPM: The powerful pump maintains stable coolant flow so the loop responds quickly to thermal spikes without audible whine at typical speeds.
• Pressure-optimized 140mm FDB PWM fans: Fans are tuned for static pressure and PWM control, delivering effective push through the dense 38mm radiator while remaining quiet at standard speeds.
• 60mm VRM fan and daisy-chained cables: The included VRM fan adds local board cooling and the daisy-chained cable design simplifies wiring and reduces cable clutter.
• Magnetic, rotatable pump cover and pre-applied thermal paste: A detachable cover that rotates 90 degrees aids visual customization and the Dow Corning TC-5888 thermal paste simplifies mounting with an extra tube included.
• A-RGB synchronization: Motherboard RGB software compatibility lets users coordinate lighting effects across their system for a unified look.

Who It's For

This cooler is aimed at desktop enthusiasts and content creators who run high-TDP CPUs and want strong sustained cooling paired with customizable A-RGB. It is also a good fit for gamers who overclock and need lower package temperatures during long sessions.

It is less appropriate for compact mini-ITX builds or users unwilling to accommodate a large 420mm radiator and the added VRM fan; those users should look for smaller 240mm or 280mm AIOs that fit tighter cases and simpler installs.

Pros & Cons

Pros

• Excellent thermal headroom from the 420mm, 38mm thick radiator for heavy CPU loads.
• Quiet operation thanks to pressured-optimized FDB PWM fans and PWM-controlled pump when tuned correctly.
• Handy installation features like daisy-chained cabling, pre-applied Dow Corning thermal grease and an extra tube.
• Customizable appearance with a magnetic rotatable pump cover and full A-RGB motherboard sync.

Cons

• Large size can make installation challenging in many cases and some users report mixed experiences with mounting complexity.
• The included VRM fan and overall assembly add to the bulk, so it is not ideal for confined layouts.

Specifications

Radiator	420mm, 38mm thick
Fans	Pressure-optimized 140mm FDB PWM fans
Pump	High performance pump up to 3000RPM
VRM Cooling	60mm VRM fan included
Compatibility	Intel LGA1700, 1200, 115X; AMD AM5, AM4
Thermal Paste	Pre-applied Dow Corning TC-5888, extra tube included

Our Verdict

The LIQMAXFLO 420mm A-RGB is a strong choice for users who need top-tier sustained cooling and want quiet fans plus visual customization. It delivers clear temperature advantages for high-core CPUs and sensible installation aids, making it good value for builders with cases that accept a 420mm radiator and who are comfortable with a moderately involved installation.

Frequently Asked Questions

Is this cooler compatible with modern Intel and AMD sockets?
The unit supports Intel LGA1700, 1200, 115X and AMD AM5 and AM4, so it works with current mainstream desktop sockets.

Does it include thermal paste or do I need to buy some?
It ships with pre-applied Dow Corning TC-5888 thermal grease and an extra tube for a clean, easy installation.

Will it be loud under full load?
Most users report quiet operation because the pressured-optimized FDB PWM fans and PWM pump keep noise low at typical speeds, though maximum pump RPM can be audible if set to top speed.