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Black asymmetrical tower cooler with 135mm fan and magnetic top cover

be quiet!

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

SKU CH-JMYS-T717V MPN BK046

Air CPU cooler with six heat pipes, a 135mm PWM fan, and a hardware switch for silent or performance modes at 31.1dB(A)

  • Semi-passive mode stops the fan for silent idle
  • Hardware switch toggles between quiet and performance modes
  • Six heat pipes deliver strong thermal capacity
  • Asymmetrical layout with cut-outs clears tall RAM and VRM heatsinks
  • 135 mm Silent Wings PWM fan runs at 31.1 dB(A) maximum

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.

Highlights

  • Semi-passive mode stops the fan for silent idle
  • Hardware switch toggles between quiet and performance modes
  • Six heat pipes deliver strong thermal capacity
  • Asymmetrical layout with cut-outs clears tall RAM and VRM heatsinks
  • 135 mm Silent Wings PWM fan runs at 31.1 dB(A) maximum

Specifications

No published specifications for this item yet.

Questions about this item

How much clearance does the 135mm fan leave for tall RAM modules?

The asymmetrical design and heat-sink cut-outs are built for high RAM and VRM cooler compatibility, giving generous room for tall memory sticks.

What is the correct way to flip the hardware switch between performance and quiet modes?

Power the system down, then slide the switch to the desired position; changing it while the PC is running can cause the fan profile to stay in the previous mode.

When should the ceramic-particle coating or the 6 heat pipes be checked or replaced?

The coating and heat pipes are sealed for the life of the cooler; only the 135mm PWM fan may need cleaning or replacement after extended use.

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