be quiet! System Power 11 550W ATX 3.1 Power Supply

The be quiet! System Power 11 550W delivers reliable power for value-oriented PC builds without compromising on quietness or stability. This ATX 3.1 compliant power supply unit features PCIe 5.1 compatibility, making it ready for modern high-end graphics cards while maintaining the proven reliability be quiet! is known for.

ATX 3.1 Standard with PCIe 5.1 Support

Built to the latest ATX 3.1 specifications, this 550W PSU includes one PCIe 5.1 12V-2x6 connector capable of delivering up to 600W for next-generation graphics cards. Additionally, it provides up to three PCIe 6+2 pin connectors for compatibility with both current and legacy GPUs, ensuring flexible connectivity options for various system configurations.

Silent Operation with Temperature-Controlled Fan

The 120mm rifle bearing fan uses a 4-pole motor design with intelligent temperature control, keeping noise levels remarkably low. At 10% load, the fan operates at just 10.4 dB(A), rising only to 11.0 dB(A) at 50% load. Even under full load, the fan maintains a reasonable 24.2 dB(A), ensuring your system remains quiet during intensive tasks.

80 PLUS Bronze Efficiency

Certified 80 PLUS Bronze, this power supply achieves up to 89.7% efficiency at 50% load and maintains 86.6% efficiency even at full 550W output. The efficient design reduces energy waste and heat generation, contributing to lower electricity costs and improved system longevity. Standby power consumption remains below 0.1W, meeting modern ErP requirements.

Rock-Solid DC-to-DC Technology

The System Power 11 employs double forward topology with DC-to-DC conversion for tight voltage regulation across all rails. The single 12V rail delivers a robust 45.83A (550W combined), providing stable power for demanding components. Comprehensive protection features include OTP, OCP, OPP, SCP, OVP, UVP, and SIP, safeguarding your hardware investment.

Practical Cable Configuration

While non-modular, the cable layout is thoughtfully designed with seven cables covering all essential connections: one 20+4-pin ATX motherboard connector (79cm length), one P4+4 CPU connector, one P4 CPU connector, one 12V-2x6 PCIe 5.1 cable, two PCIe 6+2-pin connectors, five SATA connectors, and one PATA connector. The main 24-pin cable features sleeving, while other cables use flat ribbon design for easier cable management.

German Engineering with 5-Year Warranty

Conceived, designed, and quality-controlled in Germany, the System Power 11 550W is backed by a comprehensive 5-year manufacturer's warranty. The unit measures 140mm x 150mm x 86mm and weighs 1.92kg, fitting standard ATX cases. With an expected lifetime exceeding 100,000 hours at 25°C and operational capability up to 40°C ambient temperature, this PSU is built for long-term reliability.

SYSTEM POWER 11 550W

Proven Reliability, Quiet Operation System Power 11 is the ATX 3.1 PSU for value-oriented PC builders that do not want to pass on reliability and quietness.

Highlights

ATX 3.1 PSU with support for PCIe 5.1 GPUs and GPUs with 6+2 pin connectors
Temperature-controlled 120mm quality fan reduces system noise
Rock-solid stability with a strong 12V-rail
Tight voltage regulation using DC-to-DC technology
Up to one PCIe 5.1 12V-2x6 600W and up to 3 PCIe 6-2 connectors for high-end GPUs
Dependable operation to support powerful GPUs
Stand-by drain of less than 0.15 watts
80 PLUS Bronze efficiency (up to 90.0 %)
5-year manufacturer's warranty
Product conception, design and quality control in Germany

General

Model
System Power 11 550 W

Continuous power (W)
550

Peak power (W)
No

Form factor
Version 3.1

Form factor EPS 12V
Version 2.92

Topology
Double forward + DC-DC

Digitally controlled
No

Voltage (Vac)
200 - 240

Frequency (Hz)
50

Input current (A)
4

Power factor at 100% load
>0.98

Modern standby
Yes

Power consumption in standby (W)
<0.1

Average life time (h / 25°C)
>100,000

Operating temperature up to (°C)
40

Efficiency
80 PLUS certification
Efficiency (%) at 230V, 2% load64.4 Bronze
Efficiency (%) at 230V, 10% load 84.4 Bronze
Efficiency (%) at 230V, 20% load 88.6 Bronze
Efficiency (%) at 230V, 50% load 89.7 Bronze
Efficiency (%) at 230V, 100% load 86.6 Bronze

Fan and cooling technology

Cybenetics Noise Rating
No

Fan
Silence-optimized be quiet! fan

Fan size (mm)
120

Bearing technology
Rifle

Motor technology
4-pole fan motor

Max. fan speed (rpm)
1800

dB(A) at 10% load
10.4

dB(A) at 20% load
10.8

dB(A) at 50% load
11.0

dB(A) at 100% load
24.2

Output

Multi-rail operation (12V rails)
No

12V single rail operation
Yes

Overclocking key
No

+3.3V (A)
20

+5V (A)
20

+12V1 (A)
45.83

+12V2 (A)
no

+12V3 (A)
No

+12V4 (A)
No

+12V5 (A)
No

+12V6 (A)
No

-12V (A)
0.3

+5Vsb (A)
3

Max. combined power 12V (W)
550

Max. combined power 12V-2x6 (W)
300

Max. combined power 3.3V + 5V (W)
120

Hold-up time at 100% load (ms)
16.86

Hold-up time at 80% load (ms)
20.92

Power good signal (ms)
100 - 150

Cables and connectors

Modular cables
No

Sleeved cables
P24

Flat cables
P4+4, P4, PCIe, drives

Maximum cable length (cm)
55

Cable length to motherboard (cm)
79

No. of cables
7

ATX-Motherboard (20+4-pin)
1

P4+4 (CPU)
1

P8 (CPU)
No

P4 (CPU)
1

12V-2x6 cables
1

PCI-e 6+2-pin (GPU)
2

PCI-e 6-pin (GPU)
No

SATA
5

PATA
1

FDD (Floppy)
No

Protection

OTP (over temperature protection)
Yes

OCP (over current protection)
Yes

OPP (over power protection)
Yes

SCP (short circuit protection)
yes

OVP (over Voltage protection)
Yes

UVP (under Voltage protection)
Yes

SIP (Surge & Inrush protection)
Yes

Safety certification

BSMI
No

CB
No

CCC
No

CE
Yes

cRUus
No

cTUVus
No

CU
Yes

FCC
No

RCM
No

TUV
Yes

UKCA
Yes

IRAM
No

Environmental directives

ErP
Yes

WEEE
Yes

RoHS
Yes

Triman
No

Scope of delivery

Thumb screws
No

Screws
Yes

Cable ties
Yes

Velcro cable ties
No

User manual languages
No

OCK slot bracket with switch / OCK jumper
No

SFX-to-ATX adapter bracket
No

Casing

Dimensions without cable (L x W x H), (mm)
86 x 150 x 140

Weight (kg)
1.92

Color
Black

Logistics data and RRP

Dimensions, package (L x W x H), (mm)
268 x 195 x 97

Gross weight, package (kg)
2.3

Pieces per packaging unit
6

Dimensions, shipping box (L x W x H), (mm)
556 x 311 x 218

Gross weight, shipping box (kg)
14.9

Service

Warranty (Years)
5

• Wattage: 550W
• Size/Version: ATX 3.1
• Modular: No
• SATA Connections: 5
• Certification: Bronze
• Colour: Black