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ARCTIC Liquid Freezer III Pro 420

ARCTICCPU cooler

Liquid Freezer III Pro 420

Released July 2025.11Reviewkitguru.net/components/cooling/james-dawson/arctic-liquid-freezer-iii-pro-420-aio-cpu-cooler-review/all/1Read 14 October 2026Review published 2025-08-20 for the Liquid Freezer III Pro 420 (black, no lighting mentioned). Last checked 16 October 2026.

Cooler type
AIO liquid
Fans
3
Rated TDP
Not available
CPU sockets
AM5, AM4, LGA1851, LGA1700

35 of 54 fields known.

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At a glance

All specs

SourceCalculated

General

Series
Liquid Freezer III Pro8Owner's manualsupport.arctic.de/products/liquid-freezer-iii-pro-420/techdocs/Quick_Manual_AMD_r1b.pdfRead 14 October 2026Quick start guide title: Liquid Freezer III Pro Series.
Model numbers
ACFRE00181A, ACFRE00185A, ACFRE00189A1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026
GTIN / EAN
4895265000348, 840033403016, 4895265000355, 840033403023, 4895265000362, 8400334030301Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026Shipping information: SKU ACFRE00181A, EAN 4895265000348, UPC 840033403016. The A-RGB sheet gives EAN 4895265000355 and UPC 840033403023 for ACFRE00185A, and EAN 4895265000362 and UPC 840033403030 for the white ACFRE00189A.
Announced
9 July 202512Press articleclub386.com/arctic-launches-liquid-freezer-iii-pro-in-280mm-and-420mm-flavoursRead 14 October 2026Date of the Club386 launch article. ARCTIC's own release could not be opened.
Status
Available1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026The arctic.de store lists the black model ACFRE00181A with an add-to-cart button on the access date.
Predecessor
Not available
Successor
Not available
Launch price (US)
$148.9912Press articleclub386.com/arctic-launches-liquid-freezer-iii-pro-in-280mm-and-420mm-flavoursRead 14 October 2026Price table: Liquid Freezer III Pro 420 regular price $148.99 with a launch discount to $98.49. The regular price is stored, not the discounted one. 3DTested also lists an MSRP of $148.99 but could not be opened.
Launch price (EU)
Not available
Markets
US, EU1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026The arctic.de store sells in EUR incl. VAT. The US market comes from the Club386 launch report in USD.12Press articleclub386.com/arctic-launches-liquid-freezer-iii-pro-in-280mm-and-420mm-flavoursRead 14 October 2026USD launch prices point to the US market.
Colours
Black, White1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Product information: Colour Black. The A-RGB pages list Black (ACFRE00185A) and White (ACFRE00189A).
Cooler type
AIO liquid1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026
Air cooler layout
Not available
Rated TDP (claimed)
Not available
Base material
Copper1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Spec sheet: Cold Plate Copper, Micro Skived Fins. No plating is stated.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026
Thermal paste
Included1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Feature text: Includes MX-6 Thermal Paste. The spec sheet lists TIM MX-6 (0.8 g). The tube is separate from the pump.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026

Compatibility

CPU sockets
AM5, AM4, LGA1851, LGA17001Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026The product information block and the spec sheet name LGA1851, LGA1700, AM5 and AM4 under Compatibility. The shop filter line also lists Intel 115X and 1200, but the spec sheet and manual do not, so they are not stored.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026
RAM height clearance
Not available
Offset mounting
Yes1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Feature text: Offset Mounting for Intel and AMD shifts the cold plate to the CPU hotspot.6Owner's manualsupport.arctic.de/liquid-freezer-III-pro-420Read 14 October 2026AM4 step: the offset mounting leaves parts of the heatspreader visible because the CPU hotspot is off-centre.

Heatsink

We could not find any of these 3 fields. Show them
Heat pipes
Not available
Heat pipe diameter
Not available
Direct-contact heat pipes
Not available

Liquid cooling

Radiator size
420mm1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Product information: Radiator Size 420.
Radiator dimensions
Length458Width138Thickness38mm(18 × 5.4 × 1.5 in)1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026General specifications: radiator dimensions 458 (L) x 138 (W) x 38 (H) mm, material aluminium.
Radiator material
Aluminium1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026
Tube length
500mm1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026General specifications: tube length 500 mm, outer 12.4 mm, inner 6.0 mm. Club386 says 450 mm, which is the 360 mm model's figure, so the sheet is followed.11Reviewkitguru.net/components/cooling/james-dawson/arctic-liquid-freezer-iii-pro-420-aio-cpu-cooler-review/all/1Read 14 October 2026Specifications list: radiator tube length 500mm.
Max pump speed
2,800rpm1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026Pump 800 to 2800 rpm, PWM controlled.
Pump power connector
4-pin PWM fan header6Owner's manualsupport.arctic.de/liquid-freezer-III-pro-420Read 14 October 2026Connect the PWM control cable: the all-in-one cable has one 4-pin plug and the individual cable has three 4-pin plugs. Headers must be set to PWM. The spec sheet shows a 4-Pin Fan Plug for the pump.
VRM fan
Yes1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 20262Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026

Fans

Included fans
ModelSize (mm)FansMin speed (rpm)Max speed (rpm)Airflow (CFM)Static pressure (mmH₂O)BearingConnector
P14 Pro14034002,5001105.2Fluid dynamic (FDB)4-pin PWM
Source1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Radiator fans: 3x P14 Pro, 400 to 2500 rpm, 110 cfm, 5.2 mmH2O, fluid dynamic bearing, 4-pin fan plug. The page and sheet state no noise level, so noise_dba is left out. The VRM fan (400 to 2500 rpm, 0.05 A) is not in the table.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026Radiator fan specifications as on the product page. 0.35 A at 12 V DC.
Fans
3

Display and lighting

RGB lighting
No1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Lighting: none. The A-RGB editions ACFRE00185A and ACFRE00189A are variant rows.
Lighting standard
Not available
Built-in screen
None1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026No screen on the pump block. Lighting: none.
Screen size
Not available
Screen resolution
Not available
Software
Not available
Needs a USB header
No6Owner's manualsupport.arctic.de/liquid-freezer-III-pro-420Read 14 October 2026The installation steps and both quick start guides connect only PWM cables. No USB cable is supplied or mentioned.

Measured

Cybenetics THETA, AMD AM5
Platinum9Measurementcybenetics.com/evaluations/coolers/97Read 14 October 2026Report ACCLR00097 is for the Liquid Freezer III Pro 420 A-RGB (P14 Pro A-RGB fans, 2360 g), tested Sep 19 to Oct 4, 2025. THETA Platinum, AIO, AM5, Ryzen 9 7900X, default mount, rated at 30 dB(A). The maker lists the same radiator and the same fan figures for the plain model, so the A-RGB report is used. Evaluated before Revision 2.0 under Revision 1.8. The report has no Intel LGA1851 results, so the LGA1851 fields are empty.
Cybenetics THETA, Intel LGA1851
Not available
Overall performance at 30 dB(A), AM5 (measured)
11,6699Measurementcybenetics.com/evaluations/coolers/97Read 14 October 2026Overall Performance 11,669 at 30 dB(A) on a Ryzen 9 7900X (PBO enabled).
Overall performance at 30 dB(A), LGA1851 (measured)
Not available
Noise at 100% fan setting (Cybenetics)
46.7dB(A)9Measurementcybenetics.com/evaluations/coolers/97Read 14 October 202646.7 dB(A) at the 100% fan setting (2366, 2400 and 2385 rpm). Hemi-anechoic chamber with a 6 dB(A) noise floor, Bruel & Kjaer 2270 G4 analyser with a 4955-A microphone, microphone 1 m from the cooler. The protocol keeps the AIO pump at full speed and does not separate its noise.
Thermal tests (measured)
Test CPULoadCPU power (W)Fan settingNoise (dB(A))CPU temperature (°C)Above ambient (°C)
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled198.920 dB(A)2092.5Not available
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled202.125 dB(A)2590.9Not available
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled201.530 dB(A)3090.2Not available
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled203.435 dB(A)3589.9Not available
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled204.140 dB(A)4088.7Not available
AMD Ryzen 9 7900XPrime95 Small FFTs, full CPU load, PBO enabled204.8100%46.788.7Not available
AMD Ryzen 9 9950XManual overclock, all-core 5.2 GHz at 1.3 V, Cinebench R23 30-minute loop, steady stateNot available100%51Not available59
AMD Ryzen 9 9950XManual overclock, all-core 5.2 GHz at 1.3 V, Cinebench R23 30-minute loop, steady stateNot available40 dB(A)40Not available61
AMD Ryzen 9 9950XPrecision Boost Overdrive, Cinebench R23 30-minute loop, average package power254Not availableNot availableNot availableNot available
Source9Measurementcybenetics.com/evaluations/coolers/97Read 14 October 2026Cybenetics Cooling Solutions Test Protocol, A-RGB edition, AM5 platform only. Ambient 25 C plus or minus 0.5 C and 30% humidity in a climate chamber, open Cooler Master Test Bench, Prime95 Small FFTs, averages of the last 4 minutes, Arctic MX-4 paste for all tests (protocol PDF), Default mount, pump at full speed. CPU power at the EPS connectors. The report does not publish a temperature above ambient. Fans reach 46.7 dB(A) at 100%.10Measurementcybenetics.com/data/Cybenetics%20Cooling%20Solutions%20Test%20Protocol_en.pdfRead 14 October 2026Test Protocol Revision 2.2: Prime95 Small FFTs for at least 10 minutes per level, values averaged over the last 4 minutes, ambient 25 C plus or minus 0.5 C, humidity 30%, Arctic MX-4 for all tests, one mount per platform, AMD test system Ryzen 9 7900X with PBO enabled. This cooler was tested under the older Revision 1.8 procedure.11Reviewkitguru.net/components/cooling/james-dawson/arctic-liquid-freezer-iii-pro-420-aio-cpu-cooler-review/all/1Read 14 October 2026James Dawson, review of 2025-08-20. AMD Ryzen 9 9950X on an ASRock X870E Nova WiFi, open test bench, Arctic MX-6 paste, Windows 11 24H2, ambient held at 19 to 21 C, at least two fresh installs. Manual overclock: all-core 5.2 GHz at 1.3 V, 30-minute Cinebench R23 loop, steady state. Row 1: fans at 100%, 51 dBA, 59 C over ambient. Row 2: fans locked to 40 dBA (almost 1600 rpm), 61 C over ambient. Row 3: Precision Boost Overdrive, the cooler held 254 W package power, and the fan setting is not stated. The charts give no other numbers. The noise distance is not stated.

Dimensions and weight

Dimensions
Not available
Heatsink dimensions
Not available
Weight
2,370g(5.2 lb)1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Spec sheet: weight 2370 g. Gross shipping weight is 2994 g.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026
Heatsink weight
Not available

In the box

In the box
VRM fan module, CPU contact frame (Intel), PWM cable (all in one), PWM cable (individual control), Metal flat washers, Screws, Shoulder screws (Intel), Mounting clips set (AMD), Spacers (AMD), T20 driver, MX-6 thermal paste (0.8 g)7Owner's manualsupport.arctic.de/products/liquid-freezer-iii-pro-420/techdocs/Quick_Manual_Intel_r1b.pdfRead 14 October 2026Packaging Content on the Intel quick start guide for the Liquid Freezer III Pro series: VRM fan module, CPU contact frame, two PWM cables, metal flat washers, screws, shoulder screws, T20 driver and MX-6 (0.8 g). The guide covers all sizes and lists screw counts as x8/x12. It lists no item that only an A-RGB edition has. The AMD guide adds a mounting clips set and four spacers.8Owner's manualsupport.arctic.de/products/liquid-freezer-iii-pro-420/techdocs/Quick_Manual_AMD_r1b.pdfRead 14 October 2026AMD quick start guide: mounting clips set x1, spacers x4, VRM fan module, two PWM cables, washers, screws and MX-6 (0.8 g).

Warranty

Manufacturer warranty (source market)
6years1Maker product pagearctic.de/en/Liquid-Freezer-III-Pro-420/ACFRE00181ARead 14 October 2026Spec sheet and product page: 6 Years. The ARCTIC warranty page says six years for the entire product range and names no market.2Maker spec sheet (PDF)arctic.de/media/b2/dc/e3/1749041473/Spec_Sheet_Liquid_Freezer_III_Pro_420_EN.pdfRead 14 October 2026

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Variants

Each variant lists only what differs from the specs above.

Model numberGTINLaunch price (US)ColoursRGB lightingLighting standardWeight
ACFRE00181A4895265000348$148.99BlackSame as baseNot availableSame as base
ACFRE00185A4895265000355$164.99BlackYesARGB 5 V2,358 g
ACFRE00189A4895265000362Not availableWhiteYesARGB 5 V2,358 g

Sources

We read 12 sources for this CPU cooler. The numbers match the markers in the sheet.

  1. Read 14 October 2026Backs 22 fields
  2. Read 14 October 2026Backs 15 fields
  3. Read 14 October 2026Backs 1 field
  4. Read 14 October 2026Backs 1 field
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  6. Read 14 October 2026Backs 4 fields
  7. Read 14 October 2026Backs 1 field
  8. Read 14 October 2026Backs 2 fields
  9. Read 14 October 2026Backs 4 fields
  10. Read 14 October 2026Backs 1 field
  11. Read 14 October 2026Backs 3 fields
  12. Read 14 October 2026Backs 5 fields

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