Be Quiet! 400W System Power 9 PSU, 80+ Bronze, Dual 12V, Cont. Power
  • Be Quiet! 400W System Power 9 PSU, 80+ Bronze, Dual 12V, Cont. Power

    Proven Reliability and Good Efficiency

    be quiet! System Power 9 400W offers renowned be quiet! reliability and quietness for price-conscious PC builders.


    • Rock-solid stability with two strong 12V-rails
    • DC-to-DC technology for tight voltage regulation
    • Multi-GPU support with two PCIe connectors
    • Temperature-controlled 120mm fan reduces system noise
    • Stand-by drain of less than 0.15 watts
    • 80PLUS® Bronze efficiency (up to 89%)
    • Attractive black sleeved cables
    • Complete suite of top safety features
    • Meets latest Intel® C6/C7, ErP and Energy Star 6.1 guidelines
    • 3-year manufacturer’s warranty
    • Product conception, design and quality control in Germany

    Very Quiet Operation 


    Attained by using a high-quality fan

    System Power 9 400W is equipped with a temperature-controlled 120mm fan. It provides you with the low noise operation that be quiet! is famous for, built into an entry-level system





    80+ Bronze Certification


    High operating efficiency

    The 80PLUS® Bronze certification is convincing evidence of this PSU’s efficient and power saving operation. It is a remarkable achievement for this class of PSU, realizing an efficiency rating of up to 89%. 


    • Specification

      Product Description

      Be Quiet! 400W System Power 9 PSU, 80+ Bronze, Dual 12V, Cont. Power

      Form Factor



      Fully Wired


      Be Quiet! System Power 9


      ATX 12V v2.4


      400 W


      1 x ATX-Motherboard (20+4-pin)
      1 x P4+4 (CPU)
      2 x PCI-E 6+2-pin (GPU)
      2 x PATA 4-pin
      5 x SATA 15-pin (HDD, Drives)

      Rail Design

      Dual +12V

      AC Input

      AC200-240 V


      Active PFC

      Fan Type

      High-quality 120mm fan
      Sleeve Bearing


      dB(A) at 20% load: 9.5
      dB(A) at 50% load: 10.4
      dB(A) at 100% load: 18.6

      80+ Certification

      80+ Bronze


      Up to 89%


      100,000 hours


      Over current
      Over voltage
      Under voltage
      Short circuit
      Over temperature
      Over power


      See Overview


      1.82 kg
      140 x 150 x 86 mm

      Package Weight

      2.2500 kg


      3 Years