ARCTIC Liquid Freezer III Pro 420 A-RGB - AIO CPU Cooler, 3 x 140 mm Water Cooling, 38 mm Radiator, PWM Pump, VRM Fan, for AMD AM5/AM4, Intel LGA1851/1770 Contact Frame - Black
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AI Verdict
A 420mm AIO with three 140mm P14 Pro A-RGB fans and a dedicated VRM fan, designed for high-performance desktop CPUs needing serious cooling.
This AIO is a strong performer for cooling high-wattage CPUs, thanks to its large 420mm radiator, three 140mm fans, and dedicated VRM fan. However, its substantial 458mm radiator length means it won't fit in many standard PC cases, making it a situational choice for builds with specific space requirements.
If a 420mm radiator is too large for your case, look for 360mm or 280mm AIOs that offer similar features like VRM cooling and contact frames.
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Pros
- Features a 458 x 138 x 38 mm radiator and three 140 mm P14 Pro A-RGB fans, providing 110 cfm airflow each for substantial cooling capacity.
- Includes an integrated 60 mm PWM-controlled VRM fan (400–2500 rpm) to lower voltage converter temperatures for stable performance.
- Comes with an Intel LGA1851/1700 contact frame for optimized pressure distribution, potentially extending CPU life and improving heat dissipation.
- Utilizes native offset mounting for both Intel and AMD, shifting the cold plate to the CPU hotspot for more efficient heat transfer.
- Offers integrated cable management, routing fan PWM cables within the hose sheathing, resulting in only one visible cable to the motherboard.
- Ships with ARCTIC MX-6 thermal paste, simplifying installation.
Cons
- The 458 mm long radiator is physically large, making case compatibility a significant concern for many builds.
- The Pro version's high-speed fans can be louder than non-Pro versions, with one test reporting 51 dBA at maximum fan speed.
- One user reported CPU temperatures of 94°C at less than half load, suggesting potential performance issues in specific scenarios or with faulty units.
Dimension Scores
The 420mm radiator, three 140mm P14 Pro A-RGB fans with 110 cfm airflow, offset mounting, and integrated VRM fan provide exceptional cooling capacity for demanding CPUs.
While generally reasonable for a 420mm AIO, the Pro version's high-speed fans can reach 51 dBA at maximum RPM, which is louder than some quieter alternatives.
It features a robust aluminum radiator, copper cold plate, reinforced EPDM tubing with braided sheathing, and a dedicated Intel contact frame, indicating durable construction.
The integrated cable management, which routes fan PWM cables within the hose sheathing, significantly reduces clutter and simplifies the build process.
Best For
- Overclocked high-end Intel LGA1851/1700 or AMD AM5/AM4 CPUs that generate significant heat.
- PC builds in full-tower cases with ample space for a 420mm radiator.
- Users who want to actively cool motherboard VRMs for increased stability and longevity.
Not Recommended For
- Compact PC builds or mid-tower cases with limited radiator mounting options.
- Users prioritizing absolute silence under all load conditions.
- Budget-focused systems where a 420mm AIO might be overkill for the CPU.
Watch Out For
- The 458mm x 138mm x 38mm radiator is massive; one user noted they 'BARELY got it in' their case, requiring careful measurement before purchase.
- While generally performing well, one user experienced 94°C CPU temperatures at 13/32 load, indicating a potential for thermal issues in some setups or with specific CPUs.
- The P14 Pro A-RGB fans, while powerful, can reach 51 dBA at maximum speed, which is louder than some competitors and the non-Pro Liquid Freezer III models.
Full Specifications
| UPC | 840033403023 |
| ASIN | B0DPHSLXSS |
| Brand | ARCTIC |
| Voltage | 12 Volts |
| Wattage | 4.2 watts |
| Material | Plastic |
| Item Weight | 5.2 pounds |
| Noise Level | 1 Sones |
| Manufacturer | ARCTIC |
| Cooling Method | Water |
| Number of Items | 1 |
| Air Flow Capacity | 110 Cubic Feet Per Minute |
| Item model number | LFIII Pro 420 A-RGB nero |
| Compatible Devices | Desktop |
| Product Dimensions | 17.5"L x 6"W x 2.7"H |
| Power Connector Type | 4-Pin |
| Maximum Rotational Speed | 2500 RPM |
| Global Trade Identification Number | 00840033403023, 04895265000355 |
What Buyers Say
The first thing you'll notice is that this 420mm AIO is seriously huge, with one user barely fitting it into their case, so measure twice before you buy. Despite its size, it's generally praised for its cooling performance, often exceeding expectations for high-end CPUs. However, the high-speed fans on this Pro version can get loud, hitting 51 dBA at max, which might be a dealbreaker if you're chasing absolute silence. There's also an outlier report of a CPU running at 94°C under partial load, which is concerning and suggests potential unit-specific issues or very specific use cases.
“Dude, this thing is a beast, my 13900K is finally chilling, but seriously, check your case dimensions like three times because this 420mm rad is no joke to cram in there!”
Common Praise
- Provides exceptional thermal performance, keeping high-end CPUs cool even under heavy loads.
- The integrated VRM fan effectively cools motherboard voltage regulators, contributing to system stability.
- The Intel contact frame is a valued addition for optimizing CPU contact and heat dissipation.
- The integrated cable management makes for a cleaner build with fewer visible wires.
- Considered a strong value for its performance compared to other AIOs on the market.
Common Complaints
- The 458mm radiator is extremely large and can be difficult to fit into many PC cases.
- Fans can be loud at higher RPMs, with one test showing 51 dBA at max speed for the Pro version.
- One user reported unexpectedly high CPU temperatures (94°C) at partial load, which is a significant concern.
Ownership Tips
- The sheer size of the 420mm radiator means you'll spend extra time planning and potentially struggling with installation, even in larger cases.
- While the VRM fan is a clever addition, its effectiveness can vary depending on your motherboard's VRM design and case airflow.
- The pre-applied MX-6 thermal paste is convenient, but some enthusiasts might still prefer to use their own application method or compound.
- The A-RGB lighting is generally well-received, but its customization options depend on your motherboard's sync technology.
Frequently Asked Questions
What CPU sockets is this cooler compatible with?
It's compatible with Intel LGA1851, LGA1700, and LGA1200 sockets, as well as AMD AM5 and AM4 sockets.
Does it come with thermal paste?
Yes, ARCTIC MX-6 thermal paste is included in the package.
How is the cable management handled?
The PWM cables for the radiator fans are integrated into the hose sheathing, so you only have one visible cable connecting to your motherboard.
What is the purpose of the integrated VRM fan?
The PWM-controlled VRM fan helps lower the temperature of your motherboard's voltage converters, which can improve system stability and extend component lifespan, especially with power-hungry CPUs.
Is the radiator really that big?
Yes, at 458mm long, it's one of the largest AIO radiators available. You absolutely need to check your PC case's specifications for 420mm radiator support before buying.
Buying Guide
When you're looking at an AIO (All-in-One) liquid cooler like this, you're basically getting a self-contained water cooling loop for your CPU. It's designed to pull heat away from your processor more efficiently than air coolers, especially for high-performance chips. The key things to consider are the radiator size, which dictates how much heat it can dissipate, and fan performance, which affects both cooling and noise. Also, check for extra features like VRM cooling if you're pushing your system hard.
Radiator Size (420mm)
Think of the radiator like the car's radiator – bigger means more surface area to shed heat. A 420mm radiator is one of the largest, meaning it can dissipate a lot of heat, making it ideal for powerful, hot CPUs. But, it also means it's physically huge and won't fit in many PC cases.
Fan Airflow (110 cfm per 140mm fan)
CFM (Cubic Feet per Minute) tells you how much air the fans can move. Higher CFM means more air is pushed through the radiator, which helps cool the liquid inside. 110 cfm per fan is a lot, indicating strong cooling potential, but also potentially more noise at max speed.
Integrated VRM Fan
VRMs (Voltage Regulator Modules) on your motherboard get hot, especially when overclocking. This small, dedicated fan cools those components directly, which can prevent throttling and extend the life of your motherboard, something most AIOs don't address.
Alternatives
If this 420mm AIO is too large, look for coolers with 360mm or 280mm radiators. If noise is a primary concern, seek out models with lower reported dBA levels at full load, even if it means slightly less raw cooling power.
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