be quiet! SILENT LOOP 3 420mm Water Cooling - BW026

be quiet! SILENT LOOP 3 420mm is a high-class water cooling solution for CPU that you can easily install in a serious gaming or workstation build. The large 420 mm radiator and three 140 mm fans provide a significant area for heat dissipation and stable temperatures under load. It supports modern sockets like AM5 and LGA 1700, as well as older platforms, making it a flexible choice for upgrades. If you are looking for quiet yet powerful cooling for a strong CPU, this kit is exactly in that direction.

What you get
With a 420 mm radiator, you have more cooling surface than standard 240/280 solutions, which means lower temperatures and lower fan speeds under the same load. The three 140 mm fans, operating in the range of 300 to 1900 RPM, allow for wide control – from nearly silent idle to aggressive cooling during heavy rendering or long gaming sessions. The total airflow of 235.2 CFM is a serious value that helps to expel warm air from the case quickly and efficiently. The 4 PIN + 5V ARGB connectors allow for PWM control and synchronization of the lighting with the rest of your build. At maximum noise level of 34.3 dBA, you can chase low temperatures without the system turning into a “turbine”.

• Large 420 mm radiator for more effective heat dissipation compared to smaller AIO solutions.
• Three fans sized 140 x 140 x 25 mm that combine high airflow and lower speeds for quieter operation.
• Wide RPM range of 300–1900 RPM, giving you flexibility between silence and maximum cooling.
• Total airflow of 235.2 CFM, suitable for powerful CPU configurations and good overall case cooling.
• Maximum noise level of 34.3 dBA, which is a reasonable compromise between performance and acoustics under full load.
• Support for multiple sockets – AM4, AM5, LGA 115x, LGA 1200, LGA 1700, LGA 1851, so you can use it for future upgrades as well.
• 4 PIN PWM and 5V ARGB connectors for precise control of speeds and synchronization of RGB effects with the motherboard.

Who it is suitable for
This water cooling solution is suitable for strong gaming configurations, overclocking enthusiasts, and people who render or work for long periods under constant load. It is also a good choice if you want a quieter build but with a powerful CPU, as long as your case supports a 420 mm radiator. It is not the most practical solution for very compact cases or budget systems, where a 240/280 AIO would make more sense.

The combination of a 420 mm radiator, three 140 mm fans, and wide socket support makes be quiet! SILENT LOOP 3 420mm a strong candidate if you want a cool and tidy build with water cooling. The most impressive aspect here is the balanced ratio between high airflow and controlled noise level.