be quiet! System Power 11 650W ATX 3.1 Power Supply

The System Power 11 650W delivers proven reliability and quiet operation for value-oriented PC builders who refuse to compromise on performance. This ATX 3.1 compliant power supply combines modern connectivity standards with dependable German engineering.

ATX 3.1 and PCIe 5.1 Compatibility

Built to support the latest generation of graphics cards, this PSU features full ATX 3.1 compliance and PCIe 5.1 compatibility. The included 12V-2x6 connector delivers up to 600W to modern high-end GPUs, while maintaining support for legacy 6+2 pin connections. Up to 3 PCIe 6+2 connectors ensure compatibility across your entire system build.

Quiet and Efficient Operation

The temperature-controlled 120mm rifle bearing fan operates at just 10.9 dB(A) at low loads, making this one of the quietest PSUs in its class. The 4-pole fan motor with silence-optimized blade design only increases speed when necessary, keeping noise levels minimal during typical usage. 80 PLUS Bronze certification guarantees up to 90% efficiency, reducing heat generation and energy costs.

Rock-Solid Power Delivery

DC-to-DC technology ensures tight voltage regulation across all rails, with a strong single 12V rail delivering 54.17A of continuous power. The double forward topology provides stable output even under demanding workloads. Comprehensive protection features include OTP, OCP, OPP, SCP, OVP, UVP, and SIP, safeguarding your components against electrical faults.

Technical Specifications

This non-modular power supply features 8 cables with a maximum length of 79cm to the motherboard. Connectivity includes 1x 20+4 pin ATX, 1x 4+4 pin CPU, 1x 4 pin CPU, 1x 12V-2x6, 2x PCIe 6+2 pin, 5x SATA, and 1x PATA connector. The unit measures 150mm x 86mm x 140mm and weighs 1.97kg.

German Quality and 5-Year Warranty

Product conception, design, and quality control are performed in Germany to be quiet!'s exacting standards. Modern standby support draws less than 0.1W in standby mode, meeting Energy Star 8.0 and ErP requirements. The unit operates reliably up to 40°C ambient temperature with an average lifetime exceeding 100,000 hours at 25°C. Every System Power 11 is backed by a comprehensive 5-year manufacturer's warranty.

SYSTEM POWER 11 650W

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 11 650 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)
5

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% load63.9 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 86.7 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)
2100

dB(A) at 10% load
10.9

dB(A) at 20% load
10.9

dB(A) at 50% load
11.8

dB(A) at 100% load
30.9

Output

Multi-rail operation (12V rails)
No

12V single rail operation
Yes

Overclocking key
No

+3.3V (A)
20

+5V (A)
20

+12V1 (A)
54.17

+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)
650

Max. combined power 12V-2x6 (W)
450

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

Hold-up time at 100% load (ms)
17.04

Hold-up time at 80% load (ms)
21.10

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
8

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

TÜV
Yes

UKCA
Yes

IRAM
No

Environmental directives

Energy Star
8.0

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)
1.97

Color
Black

Logistics data and RRP

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

Gross weight, package (kg)
2.4

Pieces per packaging unit
6

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

Gross weight, shipping box (kg)
15.2

Service

Warranty (Years)
5

• Wattage: 650W
• Size/Version: ATX 3.1
• Modular: No
• SATA Connections: 5
• Certification: Bronze
• Colour: Black