ARCTIC Liquid Freezer III Pro 420
- 420mm radiator, 3 x 140 mm water cooling
- Up to 2500 rpm, 110 CFM airflow
- 12 volts, 4.2 watts, 4-pin connector
- 6 year warranty
- 2370 g total weight
- Metal, plastic and rubber construction
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A 420mm all-in-one liquid cooler for desktops with high airflow and a six-year guarantee from ARCTIC. The listing leaves out socket support and noise figures.
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ASIN: B0DPHQ1353Category: Water Cooling Systems
Overview
A pump block on the processor sends liquid through a very long radiator, where large fans pull air across the fins. The kit is a closed loop made of metal, plastic and rubber, meant for desktop cases with room for the radiator.
A big radiator surface and a long warranty are the reasons to look at it for a hot processor or a quiet build. High airflow lets the fans work at lower speed. The limitation is size and missing detail: the listing names no sockets and gives no noise rating.
Who it's for
Workstation and enthusiast desktops with a front or top mount sized for this radiator are the target. Compact cases, and buyers who need a documented socket list, should confirm clearance and compatibility first.
Pros and cons
- Very large radiator for heavy loads
- High airflow rating
- Long warranty from the maker
- Four-pin PWM-style connection
- Socket support not listed
- Noise rating absent
- Needs a case with generous radiator space
Performance notes
The pump circulates liquid between the cold plate and radiator, and the large fins shed heat even at moderate fan speed. Fan speed sets the balance between cooling and noise, and airflow falls if dust filters or case panels restrict the intake. Mounting pressure and paste contact decide the final processor temperature.
Where it stands among water cooling systems
- #5 most-searched brand and model of the 31 water cooling systems lines we track (by search demand, not sales).
From the specs of the 15 water cooling systems we list; not a test result.
Specifications
| Brand | ARCTIC |
|---|---|
| Dimensions & fit | |
| Radiator size | 420mm (3 x 140 mm) |
| Item dimensions L x W x H | 18.03 x 5.43 x 1.5 inches |
| Item weight | 2370 g |
| Capacity & performance | |
| Maximum rotational speed | 2500 rpm |
| Air flow capacity | 110 cfm |
| Wattage | 4.2 watts |
| Cooling method | Liquid |
| Power & efficiency | |
| Power connector type | 4-Pin |
| Voltage | 12 volts |
| Construction & materials | |
| Material type | Metal, plastic, rubber |
| Compatibility & installation | |
| Compatible devices | Desktop |
| Warranty & support | |
| Warranty | 6 years |
Frequently asked questions
What do I need to install the ARCTIC Liquid Freezer III Pro 420?
The listing gives desktop use, a 420mm radiator and a length of 18.03 inches, so confirm the case supports that mount. Socket support and mounting hardware are not described, so check ARCTIC's compatibility list.
Is the Liquid Freezer III Pro 420 a fan only?
No. It is a liquid cooler with a pump block, radiator and three 140 mm fans per the title.
How fast do the fans spin?
The specs list a top speed of 2500 rpm and an airflow of 110 cfm.
How long is the warranty?
The listing gives 6 years.