ARCTIC Liquid Freezer III 420
Expert rating9 / 10
- Cooler Type:
- AIO Liquid
- Radiator Size:
- 420 mm
- Radiator Thickness:
- 38 mm
- Socket Compatibility:
- AMD AM4/AM5
- Fan Count:
- 3
- RGB Lighting:
- No
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Manufacturer: ARCTIC Last updated: September 12, 2026
ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) Review
The ARCTIC Liquid Freezer III 420 is the largest non-Pro member of ARCTIC's acclaimed Liquid Freezer III family, using a 420mm radiator and three 140mm fans to push its TDP ceiling to roughly 320W while carrying over the line's signature integrated VRM fan at ARCTIC's characteristically aggressive pricing.
The ARCTIC Liquid Freezer III 420 is the largest non-Pro member of ARCTIC's acclaimed Liquid Freezer III family, using a 420mm radiator and three 140mm fans to push its TDP ceiling to roughly 320W while carrying over the line's signature integrated VRM fan at ARCTIC's characteristically aggressive pricing.
Thermal Performance
A 420mm radiator and three 140mm fans handle roughly 320W of TDP, among the highest ceilings available in air-liquid hybrid cooling, and independent reviews consistently rank the Liquid Freezer III family at or near the top of thermal charts for the price.
Design and Build
The integrated VRM fan on the pump head, a Liquid Freezer III family signature, blows directly onto the motherboard's VRM heatsinks, a genuinely useful feature most competing AIOs skip entirely.
Comparison to Alternatives
Against the ARCTIC Liquid Freezer III Pro 420 A-RGB, covered elsewhere on this site, the Pro variant adds ARGB lighting and a thicker radiator for a price premium, while this non-Pro 420 delivers nearly identical core cooling for less. Against the Corsair iCUE Link Titan 360 RX, also covered elsewhere on this site, the larger 420mm radiator here gives ARCTIC a thermal edge, though Corsair's ecosystem and software are more polished.
Specifications
Identity
| Brand | ARCTIC |
|---|---|
| Series | ARCTIC Liquid Freezer III 420 |
| Model Number | ACFRE00137A |
Design
| Cooler Type | AIO Liquid |
|---|---|
| Radiator Size | 420 mm |
| Socket Compatibility | AMD AM4/AM5, Intel LGA1851/1700 |
Performance
| Fan Count | 3 |
|---|---|
| RGB Lighting | No |
Cooler class
| Tower Layout | Not Applicable |
|---|
Air fit and clearance
| Cooler Weight | 2235 g |
|---|
Liquid loop hardware
| Radiator Thickness | 38 mm |
|---|---|
| Tube Length | 450 mm |
| Pump Max Speed | 2800 RPM |
| VRM Fan | Yes |
Thermal capability
| Contact Frame Included | Yes |
|---|
Fans
| Fan Size | 140 mm |
|---|---|
| Max Speed | 1700 RPM |
| Airflow | 72.8 CFM |
| Static Pressure | 2.4 mmH2O |
| Bearing Type | Fluid Dynamic |
| PWM Control | Yes |
Lighting and display
| Lighting | None |
|---|
Ownership
| Warranty | 6 years |
|---|
| Pump | PWM-Controlled |
|---|---|
| Special Features | Integrated VRM Fan on Pump Head |
| Fans | 3x P14 PWM, 140mm |
| Source URL | https://www.arctic.de/us/Liquid-Freezer-III-420/ACFRE00137A |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating9 / 10
One of the best value-per-degree AIOs available at any radiator size, now in its largest non-Pro form.
Best for
- Buyers who want the largest available Liquid Freezer III radiator without paying Pro-tier ARGB pricing.
- Extreme overclocking or high-TDP workstation builds needing roughly 320W of headroom.
- Buyers who specifically value the integrated VRM fan over aesthetic extras.
Not for
- Not for cases that can't fit a 420mm radiator, which needs a genuinely large chassis.
- Not for buyers who want ARGB lighting, where the Liquid Freezer III Pro 420 A-RGB, covered elsewhere on this site, is the lit variant.
- Not for buyers who don't need this much cooling, where the smaller Liquid Freezer III 240, covered elsewhere on this site, is more than sufficient.
FAQs
What are the key specifications of the ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship)?
The ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) is a CPU cooler from ARCTIC. Key specs: Cooler Type AIO Liquid, Radiator Size 420, Height 38mm, Socket Compatibility AMD AM4/AM5, Intel LGA1851/1700, Fan Count 3.
Will the ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) work with my current setup?
The ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) lists Socket Compatibility is AMD AM4/AM5, Intel LGA1851/1700. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) best suited to?
It suits buyers who want the largest available liquid freezer iii radiator without paying pro-tier argb pricing., extreme overclocking or high-tdp workstation builds needing roughly 320w of headroom., buyers who specifically value the integrated vrm fan over aesthetic extras..
What are the drawbacks of the ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship)?
It is a poor fit for not for cases that can't fit a 420mm radiator, which needs a genuinely large chassis., not for buyers who want argb lighting, where the liquid freezer iii pro 420 a-rgb, covered elsewhere on this site, is the lit variant., not for buyers who don't need this much cooling, where the smaller liquid freezer iii 240, covered elsewhere on this site, is more than sufficient..
Compare and read more
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- ARCTIC Liquid Freezer III 420 (420mm AIO Liquid/Integrated VRM Fan/PWM Pump/Excellent Value Flagship) vs Enermax LIQTECH TR4 (360mm AIO Liquid/Full IHS Coverage Cold Plate/3x ARGB Fans/AMD Threadripper sTRX4-TR4 Specific)