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be quiet! System Power 9 400W CM offers renowned be quiet! reliability and quietness for cost-effective and reliable systems.

  • 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
  • 80 PLUS® Bronze efficiency (up to 89%)
  • Semi-modular, high-quality sleeved and flat cables
  • All-in-one cable with S-ATA, HDD and FDD connectors
  • Complete suite of top safety features
  • Meets latest Intel® C6/C7, ErP and Energy Star 6.1 guidelines
  • 3-year manufacturer’s warranty
 
 
Very Quiet Operation 
System Power 9 400W CM 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 
The 80 PLUS 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%. 
 
 
 
High Performance for Your System
System Power 9 400W CM provides stable and dependable power for CPU and GPU. It is equipped with two independent 12V-rails and supports several graphics cards with two PCI express connectors for multi-GPU systems.
 
 
 
Innovative DC-to-DC Conversion 
The PSU is equipped with DC-to-DC conversion for tight voltage regulation, even under heavy cross-loading conditions. This ensures reliable operation and makes it ready for the next generation of processors and graphics cards.
 
 
 
Semi-Modular Cable Management 
System Power 9 400W CM comes with full high-quality black sleeved cables that add a touch of class to any PC system. Thanks to the semi-modular cable management, cables that serve no purpose in the system are left out.
 
 
 
Comprehensive Protection
Top component protection with a full suite of safety functions, including OCP, OVP, OPP, OTP UVP and SCP, which provide the ultimate in secure operation.
Weight 2.3 kg
Brand

BEQUIET

EAN Number

4260052187210

Manufacturer Number

BN300

Series

Be Quiet! System Power 9

Wattage

400 W

Modular

Semi Modular

Compatability

ATX 12V v2.51

Connector(s)

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) 1 x FDD (Floppy)

Rail Design

Dual +12V

AC Input

AC200-240 V

PFC

Active PFC

Fan Type

High-quality 120mm fan Sleeve Bearing

Fan Bearing

Sleeve Bearing

Noise

dB(A) at 20% load: 9.3 dB(A) at 50% load: 9.7 dB(A) at 100% load: 15

80+ Certification

80+ Bronze

Efficiency

Up to 89%

MTBF

100,000 hours

Protection

Over current Over voltage Under voltage Short circuit Over Temperature Over Power

Additional Features

See Overview

Weight/Dimensions

1.49 kg 140 x 150 x 86 mm

Package Weight

2.3000 kg

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