CYBENETICS LTD Syrou 6, Latsia, 2231, Nicosia Cyprus
ARCTIC Liquid Freezer III Pro 420 A-RGB
Lab IDACCLR00097
TypeLiquid
  • Testing Dates: Sep 19, 2025 to Oct 4, 2025
Scheme: THETA
AMD AM5THETA Platinum · AIO · AMD AM5
No THETA levelIntel LGA1851
Aristeidis Bitziopoulos, Certification Body General Manager

THETA Cooler Performance

THETA is a Cybenetics performance rating. It is not part of our ISO/IEC 17065 certification schemes and is outside our accreditation.

Overall Performance (OP) = W × F / T, where W is the average CPU power at the EPS connectors (W), F the average CPU frequency (MHz) and T the average CPU temperature (°C). A cooler is rated on its measured OP at 30 dB(A) normalized noise output; a cooler that cannot reach 30 dB(A) is rated on its own measured 25 dB(A) point. Air and AIO coolers have separate ladders on each test platform.

Evaluated before Revision 2.0 of the Cooling Solutions Test Protocol: the THETA level was assigned from the published results measured under Revision 1.8 (20 minutes per noise level, 10-minute cool-down). The cooler was not measured again, and the earlier procedure is not identical to the procedure of Revision 2.0.

PlatformTHETA levelTest CPUMountRated atOverall Performance (OP)
AMD AM5THETA Platinum · AIO · AMD AM5AMD Ryzen 9 7900X (AM5)Default30 dB(A)11,669
Intel LGA1851No THETA levelIntel Core Ultra 9 285K (LGA1851)Default--

General Information

Test Equipment

Noise Test Environment Hemi Anechoic Chamber with 6dB(A) noise floor
Sound Analyzer Bruel & Kjaer 2270 G4
Microphone Bruel & Kjaer Type 4955-A
Temperature Logger Picoscope TC-08
Climate Chamber Giant Force GTH-800-20-CP-AR
Testing Methodology Cybenetics Cooling Solutions Test Protocol

DUT Information

BrandARCTIC
ModelLiquid Freezer III Pro 420 A-RGB
Lab IDACCLR00097
Testing DatesSep 19, 2025 to Oct 4, 2025
EngineerAris Bitziopoulos

Climate Chamber

Noise Test EnvironmentHemi Anechoic Chamber with 6dB(A) noise floor
ManufacturerGiant Force
Model NumberGTH-800-20-CP-AR
Temperature Range-20℃ ~ +100℃
Humidity Range20% ~ 98% RH
Temperature/Humidity Constancy±0.2℃; ±2.5%RH
Temperature/Humidity Uniformity at center±0.5℃; ±4%RH
Internal Dimensions (WHD)100 x 100 x 80 cm
External Dimensions (WHD)145 x 190 x 135 cm
Net Weight (approximately)450 Kg
Heat-up Time (No load, no linear)(from 20°C to +100°C) 30min
Pull-down Time (No load, no linear)(from 20°C to -20°C) 50min
Cooling SystemAirtight compressor + evaporator fins + air-cooling condenser
Power Source3Φ AC 380V ±5%, 50Hz±1% 10KW
Based on StandardsISO 5801-2007, AMCA 210-0, ASHRAE 51-2007, IEC 61591-2005, GB/T 1236-200

AMD Test System

Mainboard Asus TUF GAMING X670E-PLUS
CPU AMD Ryzen 9 7900x
GPU Embedded
NVMe XPG GAMMIX S50 Lite 1TB
RAM XPG Lancer DDR5 (2 x 16GB) 6000MHz
Power Supply Seasonic Vertex 1200W
(Cybenetics Platinum)
CPU Cooler Device Under Test
Case Cooler Master Test Bench

Technical Specifications

Manufacturer (OEM)ARCTIC
ModelLiquid Freezer III Pro 420 A-RGB
Number of Fans3
Fan #1ARCTIC P14 Pro A-RGB
Fan #2ARCTIC P14 Pro A-RGB
Fan #3ARCTIC P14 Pro A-RGB
TypeLiquid
Radiator Size420mm
Radiator Thickness38mm
Radiator MaterialAluminium
Pump Speed2818RPM
Tube Length500mm
Tube Diameter12mm
Cold Plate Dimensions32 x 28.5 mmmm
Weight2360g
RGB LightingYes
AMD Processors SupportAM5, AM4
Intel Processors SupportLGA1851,1700,1200,115x
Warranty6 years

Noise Output and Fan Speed

Table

Fan SettingNoise (dB(A))Fan 1 (RPM)Fan 2 (RPM)Fan 3 (RPM)
40%26.6114511511143
50%31.7136413691361
60%36.1159115931586
70%39.6181518181809
80%42.7203020402036
90%45.2225522722250
100%46.7236624002385

Graphs

Noise Output vs Fan SettingdB(A) [lower is better]Noise Output vs Fan SettingdB(A) [lower is better]25303540455040%50%60%70%80%90%100%26.631.736.139.642.745.246.7
Fan Speed vs Fan SettingRPMFan Speed vs Fan SettingRPM100015002000250040%50%60%70%80%90%100%1145136415911815203022552366Fan 11151136915931818204022722400Fan 21143136115861809203622502385Fan 3

Fan Speed at Fixed Noise Levels

Noise LevelPWM (%)Fan 1 (RPM)Fan 2 (RPM)Fan 3 (RPM)
15 dB(A)23765768764
20 dB(A)29897901895
25 dB(A)37107810811077
30 dB(A)46127712801276
35 dB(A)57152215241818
40 dB(A)71183118401834

AMD System Test Results

Table

ConditionCPU Temperature (°C)CPU Frequency (MHz)CPU Power (W)Overall Performance
20 dB(A)92.55210198.911201
25 dB(A)90.95220202.111611
30 dB(A)90.25227201.511669
35 dB(A)89.95235203.411839
40 dB(A)88.75245204.112060
Full fan speed88.75247204.812116

Graphs

CPU Temperature - AMD SystemDegrees Celsius [lower is better]CPU Temperature - AMD SystemDegrees Celsius [lower is better]88899091929320 dB(A)25 dB(A)30 dB(A)35 dB(A)40 dB(A)Full fan speed92.590.990.289.988.788.7
CPU Frequency - AMD SystemMHz [higher is better]CPU Frequency - AMD SystemMHz [higher is better]52005210522052305240525020 dB(A)25 dB(A)30 dB(A)35 dB(A)40 dB(A)Full fan speed5209.75220.55226.65234.75245.15246.6
CPU Power - AMD SystemWattsCPU Power - AMD SystemWatts19819920020120220320420520 dB(A)25 dB(A)30 dB(A)35 dB(A)40 dB(A)Full fan speed198.9202.1201.5203.4204.1204.8
Overall Performance - AMD SystemScore [higher is better]Overall Performance - AMD SystemScore [higher is better]11200114001160011800120001220020 dB(A)25 dB(A)30 dB(A)35 dB(A)40 dB(A)Full fan speed11201.11161111669.411839.112060.212116.3

ARCTIC Liquid Freezer III Pro 420 A-RGB

ARCTIC Liquid Freezer III Pro 420 A-RGB
All data and graphs included in this test report can be used by any individual on the following conditions:
› It should be mentioned that the test results are provided by Cybenetics
› The link to the original test results document should be provided in any case
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