Be Quiet! 550W Straight Power 11 PSU, Fully Modular, Fluid Dynamic Fan, SLI/XFire, 80+ Gold

  • Form Factor: ATX
  • Series: Be Quiet! Straight Power 11
  • Modular: Fully Modular
  • Compatability: ATX 12V 2.4 & EPS 12V 2.92
  • Wattage Range: 450 – 560W
  • Wattage: 550 W
  • Connectors: 1 x ATX-Motherboard (20+4-pin)
    1 x P4+4 (CPU)
    2 x PCI-E 6+2-pin (GPU)
    3 x PATA 4 pin
    9 x SATA 15-pin (HDD, Drives)
    1 x FDD (Floppy)
    3 x Mainboard connector (PATA 4-pin)
  • Rail Design: Quad +12V
  • AC Input: AC 100-240 V
  • PFC: Active PFC
  • Fan Type: SilentWings 3 fan (fluid-dynamic bearing)
  • Fan Bearing: Fluid / Hydraulic Bearing
  • Noise: dB(A) at 20% load: 9.02
    dB(A) at 50% load: 9.46
    dB(A) at 100% load: 17.22
  • 80+ Certification: 80+ Gold
  • Efficiency: up to 93%
  • MTBF: 100,000 hours
  • Protection: Over current
    Over voltage
    Under voltage
    Short circuit
    Over temperature
    Over power
  • Features: See Overview
  • Weight/Dimensions: 1.51 kg
    160 x 150 x 86 mm
  • Package Weight: 3.0400 kg
  • Warranty: 5 Years
  • World Class Quiet and Efficency

    be quiet! Straight Power 11 550W raises the bar for systems that demand virtually inaudible operation without power quality compromises.
    • Virtually inaudible SilentWings® 3 135mm fan
    • Funnel-shaped fan opening of the PSU case for high airflow intake
    • Wire-free inside the PSU on the DC side for enhanced cooling and longevity 
    • Full cable management for maximum build flexibility
    • 80PLUS® Gold efficiency (up to 93%)
    • Powerful multi-GPU support with two PCI-Express connectors
    • Japanese 105°C-rated capacitors ensure stability and reliability
    • ErP and Energy Star 6.1 ready
    • 5-year manufacturer’s warranty


    Silent Wings® 3 Fan

    Provides virtually inaudible operation
    The high-end SilentWings® 3 fan delivers best-of-class airflow yet produces very little noise. This is thanks to its unique, optimized fan blade design along with an advanced fluid-dynamic bearing and 6-pole fan motor that largely eliminates operational noise, has a super-long life and minimal power consumption.


    Funnel-Shaped Fan Opening
    Higher cooling performance
    The fan inlet of the Straight Power 11 550W is funnel-shaped. It causes an increased throughput of air which benefits to a higher cooling performance.
    Wire-Free Design Inside The PSU
    Pushing the longevity of components to a maximum
    An absolute innovation: The Straight Power 11 550W is wire-free on the DC side inside the PSU body. This results in improved cooling airflow and less signal disturbance, simply because of a lack of wiring, and ultimately pushes the lifetimes of the components to a maximum.


    Fully Modular Cable Management
    Utmost convenience and compatibility
    Thanks to the fully modular cable management, cables that serve no purpose in the system are left out. For this reason systems always appear very tidy. At the same time installation is performed much more conveniently. A smoother airflow results from the uncluttered layout of the system, which means lower noise and temperatures prevail inside the case.
    80PLUS® GOLD Certified
    Impressively high efficiency
    Straight Power 11 550W is certified with 80PLUS® Gold efficiency, reaching up to 93%. This gives less power consumption and a cooler and quieter operation. Truly a benefit for any system.


    High-Class Technologies
    Compatibility for the systems of tomorrow
    The use of LLC and Synchronous Rectifier (SR) provides very stable operation and enhanced voltage regulation.The PSU is equipped with DC-to-DC conversion for tight voltage regulation even under heavy cross-loading conditions. This ensures reliable operation with the next generation of processors and graphics cards.


    Japanese 105° Capacitors
    A testament to high quality
    Only the best components are used in Straight Power 11 550W. That is why we have built only high-quality Japanese capacitors into the PSU chassis. They are rated to 105°C, ensuring stability, reliability and a long operating life.
    Weight 3.0400 kg

    Form Factor

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