CYBENETICS LTD Syrou 6, Latsia, 2231, Nicosia Cyprus
be quiet! Silent Loop 3 420mm
Serial Number026V4480000036
Lab IDBQCLR00084
TypeLiquid
  • Testing Dates: Feb 11, 2025 to Feb 25, 2025
Scheme: THETA
AMD AM5THETA Gold · AIO · AMD AM5
THETA Silver · AIO · Intel LGA1851Intel 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 Gold · AIO · AMD AM5AMD Ryzen 9 7900X (AM5)Default30 dB(A)11,283
Intel LGA1851THETA Silver · AIO · Intel LGA1851Intel Core Ultra 9 285K (LGA1851)Default30 dB(A)14,127

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

Brandbe quiet!
ModelSilent Loop 3 420mm
Serial Number026V4480000036
Lab IDBQCLR00084
Testing DatesFeb 11, 2025 to Feb 25, 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

Intel Test System

Mainboard ASRock Z890 Taichi [BIOS: 2.09.AS01 - Nov 4, 2024]
CPU Intel Core Ultra 9 285K
GPU Embedded
NVMe XPG GAMMIX S50 Lite 1TB
RAM Gskill Ripjaws S5 DDR5 (2 x 16GB) 6000MHz
Power Supply Seasonic Vertex 1200W
(Cybenetics Platinum)
CPU Cooler Device Under Test
Case DimasTech Bench

Technical Specifications

Manufacturer (OEM)be quiet!
ModelSilent Loop 3 420mm
Number of Fans3
Fan #1be quiet! Silent Wings 4 120mm High-Speed
TypeLiquid
Radiator Size420mm
Radiator Thickness27mm
Radiator MaterialAluminium
Pump Speed3500RPM
Tube Length400mm
Tube Diameter10.06mm
Cold Plate Dimensions93.5 x 80mm
Weight2010g
AMD Processors SupportAM5, AM4, TR5, TR4
Intel Processors SupportLGA1851/1700/1200/1150/1151/1155

Noise Output and Fan Speed

Table

Fan SettingNoise (dB(A))Fan 1 (RPM)Fan 2 (RPM)Fan 3 (RPM)
40%20.7898886904
50%26.8109410791095
60%31.3126912581280
70%33.2143114381450
80%33.5159315831612
90%35.8175617461761
100%38.0188618801919

Graphs

Noise Output vs Fan SettingdB(A) [lower is better]Noise Output vs Fan SettingdB(A) [lower is better]202530354040%50%60%70%80%90%100%20.726.831.333.233.535.838
Fan Speed vs Fan SettingRPMFan Speed vs Fan SettingRPM80010001200140016001800200040%50%60%70%80%90%100%898109412691431159317561886Fan 1886107912581438158317461880Fan 2904109512801450161217611919Fan 3

Fan Speed at Fixed Noise Levels

Noise LevelFan 1 (RPM)Fan 2 (RPM)Fan 3 (RPM)
15 dB(A)745745745
20 dB(A)865865865
25 dB(A)102010201020
30 dB(A)120012001200
35 dB(A)170017001700

AMD System Test Results

Table

ConditionCPU Temperature (°C)CPU Frequency (MHz)CPU Power (W)Overall Performance
20 dB(A)91.75214197.111199
25 dB(A)90.95222198.711421
30 dB(A)91.15230196.511283
35 dB(A)90.45244198.911538
Full fan speed89.55253199.111692

Graphs

CPU Temperature - AMD SystemDegrees Celsius [lower is better]CPU Temperature - AMD SystemDegrees Celsius [lower is better]8989.59090.59191.59220 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed91.790.991.190.489.5
CPU Frequency - AMD SystemMHz [higher is better]CPU Frequency - AMD SystemMHz [higher is better]52105220523052405250526020 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed5213.75221.75229.65243.85252.6
CPU Power - AMD SystemWattsCPU Power - AMD SystemWatts196.5197197.5198198.5199199.520 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed197.1198.7196.5198.9199.1
Overall Performance - AMD SystemScore [higher is better]Overall Performance - AMD SystemScore [higher is better]1110011200113001140011500116001170020 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed11198.911421.311283.311537.611692.1

Intel System Test Results

Table

ConditionCPU Temperature (°C)CPU Frequency (MHz)CPU Power (W)Overall Performance
20 dB(A)92.24192299.613615
25 dB(A)90.04184300.513972
30 dB(A)88.84189299.414127
35 dB(A)86.84208298.314464
Full fan speed78.64260298.516174

Graphs

CPU Temperature - Intel SystemDegrees Celsius [lower is better]CPU Temperature - Intel SystemDegrees Celsius [lower is better]758085909520 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed92.29088.886.878.6
CPU Frequency - Intel SystemMHz [higher is better]CPU Frequency - Intel SystemMHz [higher is better]41804200422042404260428020 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed4192.44183.94189.34207.84260.5
CPU Power - Intel SystemWattsCPU Power - Intel SystemWatts298298.5299299.5300300.520 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed299.6300.5299.4298.3298.5
Overall Performance - Intel SystemScore [higher is better]Overall Performance - Intel SystemScore [higher is better]1350014000145001500015500160001650020 dB(A)25 dB(A)30 dB(A)35 dB(A)Full fan speed13615.513971.714127.31446416174

Frequency Plots

Pump 25%

Pump 50%

Pump 75%

Pump 100%

be quiet! Silent Loop 3 420mm

be quiet! Silent Loop 3 420mm
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
CYBENETICS LTD Syrou 6, Latsia, 2231, Nicosia Cyprus
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