Arctic Liquid Freezer III Pro 420 AIO CPU Cooler Review

James Dawson August 20, 2025 Cooling, Featured Tech Reviews, Reviews

Rating: 9.0.

Arctic Liquid Freezer II and III AIOs have been very popular with the enthusiast PC building community due to the solid thermal performance and excellent value for money. However, Arctic now offers a new Pro version of the Liquid Freezer III, featuring new high-speed fans and it is even available in a 420mm variant. But does it still deliver the same solid thermal performance and excellent value for money? Let’s find out.

Timestamps:

00:00 Start
00:49 The Cooler / Fans / Pricing
01:44 Updates / Changes / Compatibility
02:44 Quick feature run down / Close look
06:20 The Fans
07:33 The Pump / VRM Fan
07:47 Base of CPU Block
08:03 Accessories
08:41 Installation / Test System
12:07 Noise Output
12:38 CPU Temperature Manual OC – 100% fans
12:58 CPU Temperature Manual OC – 40dBa
13:23 PBO Test
13:55 Closing Thoughts

Features:

Arctic's latest 420mm AIO is updated and equipped with the P14 Pro series high-speed fans for improved thermal performance compared with standard non-Pro models.
It features an easy installation process and two control options, allowing the user to either control fan, pump and VRM fan speed independently or together using the all-in-one cable option.
The Liquid Freezer III Pro utilises a premium-class radiator, unlike most other AIO coolers that use a 27mm thick core, the Liquid Freezer III Pro uses a thicker 38mm core for optimal cooling surface area.