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Be Quiet! 1200W Modular PSU - Dark Power Pro 11

  • Fluid 135mm SilentWings® 3 Fan
  • Equipped with a Single 12v Rail
  • 80 Plus Platinum
  • Modular Design
  • SLI/XFire Ready

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QuickFind: 728223

Mfr part code: BN255

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    Be Quiet! 1200W Modular PSU - Dark Power Pro 11 Product Description

    Legendary Silence, Cutting Edge Performance
    It is a fact of the modern world that high technology requires constant refinement and unending improvement - and that is even truer for those who would be leaders. Dark Power Pro power supplies are renowned as the world's quietest and most efficient high-performance PSUs. The Dark Power Pro 11 1200W model takes that a step further with a power conversion topology that delivers 80PLUS® Platinum performance, add to that an unparalleled array of enhancements that augment this unit's compatibility, convenience of use, reliability, and safety, and the result is the most technologically-advanced power supply be quiet! has ever built.
    • 80PLUS® Platinum certification and up to 94% power conversion efficiency
    • Virtually inaudible operation thanks to a broad array of optimizations, including the use of a be quiet! SilentWings® 3 135mm fan
    • SilentWings® 3 fan features an advanced fan frame, an airflow-optimized fan blade, fluid-dynamic bearing with copper core and a high-quality 6-pole motor for less vibration
    • The funnel-shaped fan opening of the PSU case is significant big and allows high airflow intake
    • 1200 Watts of continuous power provide intensive power reserves for demanding computing applications
    • Overclocking key allows switchover between quadruple independent 12V-rail mode and high-performance single-rail operation
    • NVIDIA SLI Ready and AMD CrossFireX certifications allow you to build powerful Multi-GPU systems with confidence
    • Cable management with extra long cable reach simplifies component installation and reduces annoying clutter, increasing airflow and improving cooling in even the largest PC cases
    • Product conception, design and quality control in Germany
    • Advanced, high-resolution gaming and multimedia systems
    • Overclocked systems
    • Multi-GPU workstations for 3D graphics, photo editing, video editing
    • Any application that requires high power with superior quietness
    Energy Efficiency
    • 80PLUS® Platinum certification with up to 94% efficiency
    • Saving power means saving money, but it also mean less waste heat, less cooling required, and overall quieter operation
    • Standby drain less than 0.10Watts
    • Meets Energy Star 6.0 guidelines
    • Fulfills the ErP 2014 guidelines
    • Zero Load design supports Intel's Deep Power Down C6 and C7 modes
    Virtually Inaudible Operation
    • Installed SilentWings® 3 135mm fan includes a wide array of electronic and mechanical optimizations for best-of-class airflow with very low noise production, including:
    • Unique airflow-optimized fan blade design reduces noise-generating fan turbulence
    • Advanced fluid-dynamic bearing with copper core provides for greatly reduced operating noise and super-long life
    • 6-pole fan motor smoothes operation even at very low speeds
    • High quality IC motor controller reduces electrical noise
    • PSU case has a large funnel-shaped fan opening that facilitates high airflow intake
    • SilentWings® 3 fan is decoupled from the PSU body with special rubberized ring mount, reducing transmission of vibration and noise
    • Dual-layer PSU housing with rubberized sleeve isolates your chassis from PSU noise and vibration, further enhancing silence
    • Optimized PSU airflow generates superior cooling at lower fan speeds, reducing turbulence and allowing even quieter operation
    • Variable fan speed is optimally governed to strike the best balance between proper cooling and deep quietness
    • Up to four case fans can be connected to, and regulated by the PSU, thus reducing overall system noise even further

    • Advanced full bridge, LLC, Synchronous Rectifier (SR) and DC-to-DC power conversion circuitry design supports unmatched signal stability and unbeatable power efficiency
    • Overclocking key allows you to choose between multi-rail operation with four independent 12V-rails and high-performance single-rail operation
    • Premiere-quality Japanese capacitors rated to 105°C for maximum reliability and operating life
    • Increased output of 12V capacitors to minimize feedback sounds of graphics cards
    • Top protection for components against over-currents, over- and under-voltages, short circuits, overheating, overloads and voltage surges on input side
    • Long service life up to 150,000 hours
    • Full performance during 24/7 operation
    Maximum Compatibility and Convenience
    • Supports the latest Intel® and AMD™ processors
    • Compatible with ATX12V 2.4 and EPS12V 2.92 standards
    • Professional modular cable management system with removable cable bundles simplifies component installation, reduces annoying clutter, increases airflow and allows for improved cooling
    • Cable management with 2x P8 connector for better voltage stability for the CPU
    • System supports up to 33 connectors for massive system builds
    • Connectors are compatible with older components as well as those still on the drawing board
    • Sleeved cable lengths up to 120cm are perfect for large PC cases and allow for improved cooling in any size case
    • Individual P4 and P8 plugs support all common mainboard types
    • Nine PCIe connectors for powerful multi-GPU configurations (NVIDIA SLI and AMD CrossFireX) up to Quad-GPU
    • Clearly labeled plugs and clever accessories promote simple installation
    Outstanding Service and Support
    • 5-year manufacturer's warranty
    • Quick support is available via our international hotline, Mondays to Fridays from 9:00am to 5:30pm CET : +49 (0) 40-736 76 86 - 98

    Technical Specifications


    Cables Included Power cable - external - 1.5 m
    Features Overheat protection, over current protection, over voltage protection, overpower protection, SLI ready, undervoltage protection, short-circuit protection, 4 x 12V rail, temperature controlled fan, CrossFireX ready, Intel 4th-gen CPU (Haswell) compatible, fluid dynamic bearing cooling fan, semi-modular
    Included Accessories Cable ties, thumbscrews
    MTBF 100,000 hours
    Cooling System 135mm fan
    Compliant Standards TUV, CB, FCC, RoHS, WEEE, cTUVus, ERP, RCM, CU-TR

    Manufacturer Warranty

    Service & Support Limited warranty - 5 years
    Service & Support Details Limited warranty - 5 years

    Dimensions & Weight

    Width 15 cm
    Depth 19.3 cm
    Height 8.6 cm
    Weight 2.38 kg

    Environmental Standards


    Environmental Parameters

    Max Operating Temperature 40 °C

    Dimensions & Weight (Shipping)

    Shipping Width 34.8 cm
    Shipping Depth 27.2 cm
    Shipping Height 11.8 cm
    Shipping Weight 4.59 kg


    Device Type Power supply - active Power Factor Correction (PFC) - internal
    Specification Compliance ATX12V 2.4/ EPS12V 2.92
    PSU Form Factor ATX
    Colour Black

    Power Device

    Input Voltage AC 100-240 V
    Frequency Required 50 - 60 Hz
    Power Output Connectors Details 1 x power 24 pin ATX with detachable 4 pin section ¦ 1 x power 8 pin EPS12V ¦ 1 x power 8 pin +12V with detachable 4 pin section ¦ 7 x 4 PIN internal power ¦ 10 x 15 pin Serial ATA power ¦ 8 x 8 pin PCI Express power with detachable 2 pin section ¦ 1 x 6 pin PCI Express power ¦ 2 x 4 PIN mini-power connector
    Power Capacity 1200 Watt
    Output Current +3.3V - 25 A ¦ +5V - 25 A ¦ +12V1 - 35 A ¦ +12V2 - 35 A ¦ +12V3 - 45 A ¦ +12V4 - 45 A ¦ -12V - 0.5 A ¦ +5VSB - 3 A
    Efficiency 94.38% at 50% Load, 92.4% at 100% Load, 92.4% at 20% Load
    Modular Cable Management Yes
    80 PLUS Certification 80 PLUS Platinum

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