ARCTIC Liquid Freezer III Pro 420 A-RGB - AIO CPU Cooler, 3 x 140 mm Water Cooling, 38 mm Radiator, PWM Pump, VRM Fan, AMD AM5/AM4, Intel LGA1851/1700 Contact Frame - White
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AI Verdict
A 420mm AIO with a 38mm radiator, 140mm P14 Pro fans, and an integrated VRM fan for high-end CPU cooling.
This AIO is built for extreme cooling, featuring a 38mm radiator and 140mm P14 Pro fans, making it a strong fit for high-performance CPUs. The integrated VRM fan and Intel contact frame further enhance its capability to manage heat efficiently across the CPU and surrounding components.
If this 420mm unit is too large, look for the 360mm or 280mm versions of the Liquid Freezer III Pro, ensuring your case has at least 65mm clearance for the radiator and fans.
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Pros
- Achieves chart-topping cooling performance, beating rivals at lower fan speeds in some tests.
- Includes an Intel LGA1851/1700 contact frame for optimized CPU contact pressure and better heat dissipation.
- Features a 60mm PWM-controlled VRM fan to actively cool motherboard voltage regulators.
- Integrated cable management routes fan PWM cables through the hose sleeving, resulting in only one visible cable to the motherboard.
- The 38mm thick radiator holds more liquid than standard 27mm radiators, reducing heat buildup during temperature spikes.
- Comes with a 6-year warranty, indicating manufacturer confidence in durability.
Cons
- The combined 65mm thickness of the radiator and fans can cause significant case compatibility issues, requiring at least 63mm clearance.
- P14 Pro fans become louder when pushed to their higher maximum speeds, impacting noise levels under heavy load.
- Some motherboards may have compatibility issues due to oversized SSD coolers in the M.2_1 slot interfering with the cooler's installation.
Dimension Scores
The 38mm radiator, 140mm P14 Pro fans with 110 CFM airflow, and offset mounting contribute to chart-topping cooling performance, even beating rivals at lower fan speeds.
While quieter than previous models at low speeds, the P14 Pro fans become noticeably louder when pushed to their maximum 2500 rpm under heavy loads.
Features a thick 38mm radiator, reinforced EPDM tubing with braided sleeving, a copper cold plate, and comes with a 6-year warranty.
The PWM cables for the radiator fans are integrated into the hose sleeving, reducing cable clutter to a single visible cable connecting to the motherboard.
Best For
- Enthusiast PC builds with high-TDP Intel LGA1851/1700 or AMD AM5/AM4 CPUs that need maximum thermal headroom.
- Workstations or gaming rigs requiring sustained high performance without thermal throttling.
- Users with large PC cases that can accommodate a 420mm radiator with a 65mm total thickness.
Not Recommended For
- Compact PC builds or cases with limited radiator clearance (less than 65mm).
- Users prioritizing absolute silence under all load conditions, especially at maximum fan speeds.
Watch Out For
- The 65mm radiator-plus-fan thickness means it won't fit in many cases; you need to measure your case's top or front clearance carefully.
- Some users reported needing to remove or modify oversized M.2 SSD heatsinks on specific motherboards to prevent interference with the pump block.
- While quiet at low RPMs, the P14 Pro fans can generate noticeable noise when operating at their 2500 rpm maximum under heavy CPU loads.
Full Specifications
| UPC | 840033403030 |
| ASIN | B0DPHS13XW |
| 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 bianco |
| 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 | 04895265000362 |
What Buyers Say
Users are consistently pointing out the sheer cooling power of this AIO, often noting it outperforms other coolers even when running at lower fan speeds. The integrated VRM fan is a recurring highlight, praised for its ability to keep motherboard components cool. However, the substantial 65mm thickness of the radiator and fans is a frequent concern, leading to compatibility headaches in many cases. The included Intel contact frame is also a specific feature that users appreciate for improving CPU contact.
“Man, this thing is a beast! My i9-14900K barely breaks a sweat now, but seriously, measure your case twice because this chonky boi barely fit in my Corsair 7000D!”
Common Praise
- Keeps high-end CPUs significantly cooler than other AIOs, even when fans aren't at full blast.
- The integrated VRM fan actually lowers motherboard voltage regulator temperatures.
- The pre-installed fans and integrated cable management make installation surprisingly straightforward for a 420mm unit.
- The included Intel contact frame improves CPU contact and heat transfer.
- The 38mm radiator design handles temperature spikes effectively due to increased liquid volume.
Common Complaints
- The 65mm total thickness of the radiator and fans makes it impossible to fit in many cases without modification or external mounting.
- Fans can get loud when the CPU is under extreme load and they spin up to their 2500 rpm maximum.
- Some motherboard M.2 SSD heatsinks interfere with the pump block, requiring removal or modification.
- The white color option might not match all build aesthetics perfectly.
Ownership Tips
- The integrated cable management really does clean up the build, making it look much tidier than other AIOs I've used.
- The VRM fan is audible when it ramps up, but it's a small price to pay for cooler motherboard components.
- The included MX-6 thermal paste is actually really good, no need to buy aftermarket paste.
- The sheer weight of the 420mm radiator and pump assembly requires a sturdy case to prevent sag.
- The contact frame installation for Intel CPUs is a bit fiddly but worth it for the improved temps.
Frequently Asked Questions
Does this cooler come with thermal paste?
Yes, it includes ARCTIC's MX-6 thermal paste, which is applied in a cross pattern and distributed evenly by the water pump's cold plate.
Is the VRM fan always on?
The VRM fan is PWM-controlled, meaning its speed is regulated based on temperature, ensuring it only spins up when needed to cool the voltage converters.
What is the warranty period for this cooler?
ARCTIC provides a 6-year warranty for the Liquid Freezer III Pro 420 A-RGB.
Will this fit in my mid-tower case?
You need at least 63mm of clearance for the radiator and fans. Many mid-tower cases may struggle to fit a 420mm radiator, especially with its 65mm total thickness, so measure your case carefully.
Can I control the RGB lighting?
Yes, the A-RGB fans are controllable, and the cooler offers flexible control options for both ARGB and PWM signals, including an all-in-one cable for synchronized control.
Buying Guide
When looking at AIO CPU coolers, you're essentially buying a self-contained liquid cooling loop. The radiator size (like this 420mm one) dictates how much heat it can dissipate, and bigger is generally better for high-power CPUs. Fan quality and static pressure are key for pushing air through that radiator. Also, check the total thickness of the radiator and fans, as this is often the biggest hurdle for case compatibility.
Radiator Size (420mm) and Thickness (38mm)
This is like the engine's cooling fins in a car. A larger 420mm radiator with a 38mm thickness means more surface area and liquid volume to shed heat, allowing your CPU to run cooler, especially under heavy loads.
P14 Pro Fan (140mm, 110 CFM, 5.2 mmH2O)
These are the workhorses moving air through the radiator. High CFM (Cubic Feet per Minute) means more airflow, and high static pressure (mmH2O) means the fans can push that air effectively through the radiator's fins, even if they're dense.
Integrated VRM Fan
Think of this as a mini fan specifically for your motherboard's power delivery components (VRMs). When your CPU is working hard, these can get hot, and this fan helps keep them cool, ensuring stable system performance and longevity.
Alternatives
If this cooler is too large for your case, look for AIOs with 360mm or 280mm radiators. If you need quieter operation at maximum load, search for coolers with lower maximum fan RPMs or specific low-noise fan designs.
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