be quiet! Dark Rock 6 BK046 CPU cooler 135mm 31.1dB(A)

Target audience

The be quiet! Dark Rock 6 BK046 is a CPU air cooler built for desktop systems that demand quiet operation. It suits enthusiasts and professionals who value low acoustic output alongside reliable thermal performance. The semi-passive quiet mode stops the fan completely during light loads. A hardware switch lets users choose between quiet and performance profiles without software.

Upgrade context

This cooler replaces stock coolers or older tower designs that run louder under load. The jump is worth it when noise levels matter more than absolute maximum thermal headroom. Six optimized heat pipes and an improved fin stack raise cooling capacity over basic solutions. The 135 mm Silent Wings PWM fan delivers high static pressure at only 31.1 dB(A) maximum.

Practical limits

Air cooling performance is bounded by case airflow and ambient temperature. The asymmetrical layout with cut-outs clears tall memory modules and VRM heatsinks on most mainstream boards. Ceramic-particle coating and a magnetic top cover resist oxidation and simplify cleaning. The 46 mm fan thickness requires sufficient clearance above the CPU socket. Liquid metal thermal interfaces are supported for users who apply them.