be quiet! Silent Loop 3 420mm AIO Liquid Cooler
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About This Item
- 420 mm radiator for superior cooling performance
- Three 120 mm PWM fans with fluid dynamic bearings
- Compatible with Intel LGA 1851/1700/1200/1155/1151/1150 and AMD AM5/AM4/TR4/TR5 sockets
- Multi-colour ARGB lighting with 3-pin LED connector
- Noise levels as low as 19. 4 dB at low speed
- Maximum airflow of 78. 4 cfm with 2. 36 mmH2O air pressure
- Copper base plate with aluminum radiator construction
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be quiet! Silent Loop 3 420mm | Ultra-Silent 420mm AIO Liquid Cooler
The be quiet! Silent Loop 3 420mm is a premium all-in-one liquid cooling solution engineered for high-performance processors that demand exceptional thermal management without compromising on noise levels. This German-designed cooler combines advanced pump technology with a massive 420mm radiator to deliver virtually silent operation while maintaining peak cooling efficiency for demanding workloads.
Slim Specs Table
| Metric | Spec |
|---|---|
| Radiator Size | 420mm |
| Fan Configuration | 3x 120mm |
| Noise Level | 19.4-34.3 dB |
| Supported Sockets | LGA 1851, 1700, AM5, TR5 and more |
| Pump Speed | 1700-3500 RPM |
German Engineering Meets Silent Performance
The Silent Loop 3 420mm represents be quiet!’s commitment to combining superior cooling performance with virtually inaudible operation. The advanced Fluid Dynamic Bearing fans operate between 19.4 and 34.3 dB, making this cooler ideal for users who demand powerful cooling without the acoustic compromise typically associated with high-performance systems.
Massive 420mm Radiator for Extreme Cooling
The expansive 420mm aluminum radiator provides exceptional surface area for heat dissipation, making this cooler particularly suited for high-TDP processors and overclocking scenarios. The three 120mm fans work in perfect harmony to move up to 133.2 m³/h of air while maintaining the signature be quiet! silence that enthusiasts have come to expect.
Universal Compatibility for Modern Systems
With support for an extensive range of processor sockets including LGA 1851, 1700, AM5, and TR5, this cooler offers future-proof compatibility for both current and upcoming CPU platforms. The comprehensive mounting kit ensures straightforward installation across different system configurations.
Premium Build Quality and Materials
The copper base plate ensures optimal heat transfer from your processor, while the high-quality aluminum radiator provides excellent thermal performance. The 40cm tubing offers flexible installation options, and the multi-color LED illumination adds a customizable aesthetic touch to your build.
Box contents
- be quiet! Silent Loop 3 420mm radiator unit
- 3x 120mm be quiet! fans
- Mounting brackets for supported sockets
- Thermal grease
- Screws and installation hardware
- User manual
Check before you buy
- Confirm your case supports 420mm radiator mounting
- Verify your motherboard has compatible CPU socket
- Check available space for triple 120mm fan configuration
- Confirm your power supply has spare 4-pin connectors
- Verify case clearance for 475mm height
Frequently Asked Questions
Q: What processor sockets are supported?
A: LGA 1851, LGA 1700, Socket AM5, Socket TR5, and many others including older Intel and AMD platforms.
Q: How many fans does this cooler include?
A: Three 120mm fans with Fluid Dynamic Bearings for quiet operation.
Q: What is the noise level at maximum speed?
A: 34.3 dB, which remains relatively quiet for a high-performance cooler.
Q: What materials are used in construction?
A: Copper base plate with aluminum radiator construction.
Q: What warranty coverage is provided?
A: 3-year manufacturer warranty covering defects in materials and workmanship.
The Consultant’s verdict & warranty
The be quiet! Silent Loop 3 420mm is the ideal choice for enthusiasts and professionals building high-performance systems where cooling capacity must match processing power without creating excessive noise. Its massive radiator size, universal compatibility, and signature silent operation make it particularly well-suited for content creation workstations, gaming rigs with high-TDP CPUs, and overclocking setups. Covered by the standard Manufacturer Warranty.
| Performance | |
|---|---|
| Suitable location | Processor |
| Fan connector | 4-pin |
| Pulse-width modulation (PWM) support | Yes |
| Bearing type | Fluid Dynamic Bearing (FDB) |
| Noise level (low speed) | 19.4 dB |
| Noise level (high speed) | 34.3 dB |
| Type | All-in-one liquid cooler |
| Fan diameter | 14 cm |
| Supported processor sockets | LGA 1851, LGA 1150 (Socket H3), LGA 1151 (Socket H4), LGA 1155 (Socket H2), LGA 1200 (Socket H5), LGA 1700, Socket AM4, Socket AM5, Socket TR4, Socket TR5 |
| Maximum airflow | 78.4 cfm |
| Maximum air pressure | 2.36 mmH2O |
| Airflow | 133.2 m³/h |
| Number of fans | 3 fan(s) |
| Quantity per pack | 1 pc(s) |
| Pump connector | 4-pin |
| Pump motor speed (min) | 1700 RPM |
| Pump motor speed (max) | 3500 RPM |
| Pump motor speed | 3500 RPM |
| Fan speed (max) | 1900 RPM |
| Fan's mean time to failure (MTTF) | 300000 h |
| Design | |
| Fan connector | 4-pin |
| Number of fans | 3 fan(s) |
| Illumination colour | Multi |
| Product colour | Black |
| Cable length | 0.5 m |
| Illumination LED | Yes |
| Radiator material | Aluminum |
| Base plate material | Copper |
| LED connector type | 3-pin |
| Technical details | |
| Noise level (low speed) | 19.4 dB |
| Noise level (high speed) | 34.3 dB |
| Type | All-in-one liquid cooler |
| Fan diameter | 14 cm |
| Supported processor sockets | LGA 1851, LGA 1150 (Socket H3), LGA 1151 (Socket H4), LGA 1155 (Socket H2), LGA 1200 (Socket H5), LGA 1700, Socket AM4, Socket AM5, Socket TR4, Socket TR5 |
| Maximum airflow | 78.4 cfm |
| Maximum air pressure | 2.36 mmH2O |
| Airflow | 133.2 m³/h |
| Number of fans | 3 fan(s) |
| Cable length | 0.5 m |
| Fan connector | 4-pin |
| Illumination LED | Yes |
| Sustainability certificates | Triman |
| Warranty period | 3 year(s) |
| Compliance certificates | CE, Federal Communications Commission (FCC), RoHS, UKCA, WEEE |
| Ports & interfaces | |
| Fan connector | 4-pin |
| Pump connector | 4-pin |
| Power | |
| LED voltage | 5 V |
| Fan power consumption | 3.6 W |
| Fan voltage | 12 V |
| Fan current | 0.3 A |
| Colour | |
| Product colour | Black |
| Weight & dimensions | |
| Fan dimensions (W x D x H) | 120 x 120 x 25 mm |
| Package depth | 499 mm |
| Package width | 204 mm |
| Package height | 154 mm |
| Width | 140 mm |
| Package weight | 3.3 kg |
| Depth | 52 mm |
| Height | 475 mm |
| Weight | 2.01 kg |
| Cable length | 0.5 m |
| Radiator width | 14 cm |
| Radiator depth | 45.7 cm |
| Radiator height | 2.7 cm |
| Tube length | 40 cm |
| Waterblock width | 8 cm |
| Waterblock depth | 5.6 cm |
| Waterblock height | 9.35 cm |
| Packaging data | |
| Package depth | 499 mm |
| Package width | 204 mm |
| Package height | 154 mm |
| Package weight | 3.3 kg |
| Package type | Box |
| Indication | |
| Illumination colour | Multi |
| Packaging content | |
| Screws included | Yes |
| Package type | Box |
| Mounting kit | Yes |
| Thermal grease | Yes |
| Manual | Yes |
| CPU bracket(s) | Yes |
| Other features | |
| Pump connector | 4-pin |
| Thermal grease | Yes |
| LED voltage | 5 V |
| Logistics data | |
| Shipping (inner) case width | 42.4 cm |
| Shipping (inner) case length | 51.1 cm |
| Shipping (inner) case height | 33.6 cm |
| Shipping (inner) case gross weight | 14.8 kg |
| Products per shipping (inner) case | 4 pc(s) |
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