be quiet! Silent Loop 3 420mm AIO Liquid CPU Cooler BW026
be quiet!
be quiet! Silent Loop 3 420mm AIO Liquid CPU Cooler BW026
The be quiet! Silent Loop 3 is an all-in-one liquid CPU cooler designed for high-end processors and overclocking while maintaining near-silent operation. It combines a large 1,800 mm² fin-area cooling block, a vibration-dampened 3-chamber pump, and three optimized 140mm fans to deliver cooling performance without audible noise.
Why this product
1,800 mm² cooling block fin area
Up to 2× larger than comparable AiOs in its class, ensuring even heat distribution across all CPU hotspots and compatibility with both Intel and AMD platforms.
3-chamber pump reduces vibration and turbulence
A dedicated middle chamber acts as a reservoir, allowing coolant to settle and flow evenly before circulation, while the 6-pole 3-phase motor operates with minimal noise even at full speed.
Rated to just 34.3 dBA at maximum speed
Silence-optimized fan blades and funnel-shaped air outlets keep noise near imperceptible during regular operation, backed by 300,000-hour MTTF fan bearings.
Adjustable pump speed and refill port
Choose between silence and maximum performance on demand, and access an easy-to-refill coolant bottle to extend the cooler's lifespan and simplify maintenance.
- TypeAll-in-One Liquid Cooler
- Radiator Size420mm
- Cooling Block Fin Area1,800 mm²
- Max Noise Level34.3 dBA
- Pump Speed Range1,700–3,500 RPM
- Power Consumption13W
- Warranty3 Years Limited
- SKUBEQ-865
- EAN4260052192559
- Intel LGA 1150, 1151, 1155, 1200, 1700, and 1851 sockets.
- AMD AM4, AM5, sTR4, and sTR5 sockets.
- 420mm radiator fits standard front or top case mounts; requires 140mm fan mounting space.
- ARGB lighting is optional and requires separate connection; cooler functions without it.
Best for
- Builders prioritizing silent operation with flagship CPUs
- Overclocking enthusiasts who need sustained cooling without high noise
- Users seeking low-vibration, low-maintenance liquid cooling
- Those valuing German engineering and a 3-year limited warranty
Trade-offs
- Smaller cases: 420mm radiator and 140mm fans demand adequate front, top, or rear mounting space.
- Budget-conscious builds: All-in-one liquid cooling costs significantly more than air cooling for comparable performance.
- Mid-range CPUs: Cooling capacity and noise design are engineered for high-power flagship processors; cost is overkill for mainstream or entry-level chips.
Silent Loop 3 420mm is the virtually inaudible and incredibly high performing All-in-One water cooling unit with state-of-the-art technology. Silent Loop 3 is the epitome of a German engineered piece of hardware that embodies what be quiet! is associated with.
Silent Loop 3 420mm is ready for modern flagship CPUs like Intel's Core i9 or AMD's Ryzen 9 series, with room for overclocking.
The cooling block of Silent Loop 3 420mm is undisputed. The explanation may look complicated, but we owe it to our most loyal fans and all the enthusiasts out there: The cooling block boasts a 1,800 mm² fin area, which is an increase of up to 2x compared to many other AiO's in this class. This greatly improves heat transfer and makes sure to cover all hot spots on the CPU. The large fin area could only be achieved by a specially developed screwless design for attaching the heat plate. The internal design of the flow path takes care that all areas are flowed to evenly to achieve high performance regardless of the CPU platform.
A powerful PWM pump with 3-chamber design ensures the very high-performance of Silent Loop 3 420mm and is whisper-quiet at the same time. The second of its 3 chambers acts as a reservoir and offers enough space for the coolant to spread out and thus reduces turbulences before the liquid leaves the pump unit. In combination with the 6-pole 3-phase motor this results in a smooth and consequently silent operation.
Silent Loop 3 420mm features 3 Silent Wings 4 140mm PWM high-speed fans. These fans feature silence-optimized fan blades and a funnel shaped air outlet, making Silent Wings 4 140mm PWM high-speed a fan that makes no compromises between very quiet operation and highest performance. The corners of the frame are designed to minimize air leakage on radiators.
Silent Loop 3 420mm is a meticulously crafted masterpiece of German engineering. All parts integrated are of highest quality and work as precise as a clockwork, ultimately leading to a cooling performance ready for virtually any situation.
The cooling block's design is iconic and unmistakable. We kept it all-black and elegant to represent the sheer cooling power Silent Loop 3 420mm offers, despite being barely audible. Optionally, you can turn on ARGB LEDs. Silent Loop 3 420mm is a statement in your PC case: you strive for the maximum in any discipline.
General
| Brand | be quiet! |
|---|---|
| Model | BW026 |
| Type | All-in-One |
Performance
| Radiator Size | 420mm |
|---|---|
| Radiator Dimensions | 457 × 140 × 27 mm |
| Cooling Block Dimensions | 93.5 × 80 × 56 mm |
| Cooling Block Fin Area | 1,800 mm² |
| Tube Length | 410 mm |
Fan
| Fan System | 3 × Silent Wings 4 140mm PWM High-Speed Fans |
|---|---|
| Fan Dimensions | 140 × 140 × 25 mm |
| Fan Speed Range | Up to 1,900 RPM |
| Fan Airflow | 78.4 CFM |
| Fan Static Pressure | 2.36 mm-H₂O |
| Fan Bearing Type | Fluid Dynamic Bearings |
| Fan MTTF | 300,000 Hours |
| Fan Power Connector | 4-pin PWM |
Acoustics & Power
| Pump Speed Range | 1,700–3,500 RPM |
|---|---|
| Max Noise Level | 34.3 dBA |
| Power Consumption | 13W |
| Lighting | ARGB (optional) |
Compatibility
| Intel Sockets | LGA 1150, 1151, 1155, 1200, 1700, 1851 |
|---|---|
| AMD Sockets | AM4, AM5, sTR4, sTR5 |
Warranty & Materials
| Radiator Material | Aluminum, Black Spray Painted |
|---|---|
| Warranty | 3 Years Limited (Parts & Labor) |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.