Article number: BN300

SYSTEM POWER 9 CM

400W

Proven reliability and good efficiency

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

  • Rock-solid stability with 2 strong 12V-rails
  • DC-to-DC technology for tight voltage regulation 
  • 2 PCIe connectors for powerful GPUs
  • 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
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VERY QUIET OPERATION

Attained by using a high-quality fan

System Power 9 CM 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 PLUS® BRONZE CERTIFICATION

High operating efficiency

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

Proven reliability for CPU and GPU

System Power 9 CM 400W provides stable and dependable power for CPU and GPU. It is equipped with 2 independent 12V-rails and supports several graphics cards with 2 PCI express connectors for powerful GPUs.

INNOVATIVE DC-TO-DC CONVERSION

Equipped with a wealth of advanced technology

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

Total convenience and attractive design for cost-effective systems

System Power 9 CM 400W 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

A complete range of safety features

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.

“System Power is the entry to silent PC building, which still offers up to 80PLUS® Gold efficiency. With System Power we offer you everything you need for a reliable and cost-efficient operation.” 

Christian Berndt, Product Compliance Manager

All models at a glance:

Product Series

General data

ModelSystem Power 9 CM 400W
Continuous power (W)400
Peak power (W)-
Form factorVersion 2.51
Form factor EPS 12V-
TopologyDC/DC
Digitally controlled-
Voltage (Vac)200 - 240
Frequency (Hz)50
Input current (A)6
Power factor at 100% load>0.95
Modern standby-
Power consumption in standby (W)<0.15
Average life time (h / 25°C)100,000
Operating temperature up to (°C)40

Infographics

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Efficiency

80 PLUS certificationBronze
Efficiency (%) at 230V, 2% load-
Efficiency (%) at 230V, 10% load81
Efficiency (%) at 230V, 20% load86
Efficiency (%) at 230V, 50% load89
Efficiency (%) at 230V, 100% load87

Fan and cooling technology

FanHigh quality fan
Fan size (mm)120
Bearing technologySleeve
Motor technology4-pole fan motor
Max. fan speed (rpm)1800
dB(A) at 10% load9.1
dB(A) at 20% load9.3
dB(A) at 50% load9.7
dB(A) at 100% load15

Output

Multi-rail operation (12V rails)2
12V single rail operation-
Overclocking key-
+3.3V (A)24
+5V (A)15
+12V1 (A)22
+12V2 (A)18
+12V3 (A)-
+12V4 (A)-
+12V5 (A)-
+12V6 (A)-
-12V (A)0.3
+5Vsb (A)3
Max. combined power 12V (W)384
Max. combined power 12VHPWR (W)-
Max. combined power 3.3V + 5V (W)103
Hold-up time at 100% load (ms)17.0
Hold-up time at 80% load (ms)23.1
Power good signal (ms)100 - 150

Cables and connectors

Modular cables-
Sleeved cablesP24, P4+4
Flat cablesPCIe / drives
Maximum cable length (cm)103
Cable length to motherboard (cm)54
No. of cables5
ATX-Motherboard (20+4-pin)1
P4+4 (CPU)1
P8 (CPU)-
P4 (CPU)-
12VHPWR cables-
PCI-e 6+2-pin (GPU)2
PCI-e 6-pin (GPU)-
SATA5
PATA2
FDD (Floppy)1

Protection

OTP (over temperature protection)
OCP (over current protection)
OPP (over power protection)
SCP (short circuit protection)
OVP (over Voltage protection)
UVP (under Voltage protection)
SIP (Surge & Inrush protection)

Safety certification

BSMI-
CB
CCC-
CE
cRUus-
cTUVus-
CU
FCC-
RCM
TÜV
UKCA-

Environmental directives

Energy Star6.1
ErP
WEEE
RoHS
Triman

Scope of delivery

Thumb screws-
Screws
Cable ties-
Velcro cable ties-
User manual languagesDE, EN, ES, FR, PL, RU
OCK slot bracket with switch / OCK jumper-
SFX-to-ATX adapter bracket-

Casing

Dimensions without cable (L x W x H), (mm)140 x 150 x 86
Weight (kg)1.49
ColorBlack

Service

Warranty (Years)3
Express replacement service in first year-
International hotline / free of charge✓ / DE, FR

Logistics data and RRP

Article numberBN300
EAN code4260052187210
Dimensions, package (L x W x H), (mm)268 x 97 x 195
Gross weight, package (kg)2.11
Pieces per packaging unit6
Dimensions, shipping box (L x W x H), (mm)215 x 311 x 556
Gross weight, shipping box (kg)13.36
RRP (€)54.90

SYSTEM POWER 9 CM | 400W
Article number: BN300

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