be quiet! System Power 11 550W ATX 3.1 Power Supply
The be quiet! System Power 11 550W is an ATX 3.1 power supply unit designed for value-oriented PC builders who demand proven reliability, quiet operation, and modern connectivity.
Key Features
-
ATX 3.1 power supply with support for PCIe 5.1 GPUs and GPUs with 6+2-pin connectors
-
Temperature-controlled 120 mm be quiet! fan for reduced system noise
-
Strong 12V single rail for rock-solid system stability
-
DC-to-DC technology for tight voltage regulation
-
GPU-ready connectivity
- Up to one PCIe 5.1 12V-2x6 600W connector
- Up to three PCIe 6+2-pin connectors for high-end GPUs
-
Dependable operation to support powerful graphics cards
-
Low stand-by drain of less than 0.15 W
-
80 PLUS Bronze efficiency (up to 90.0%)
-
5-year manufacturer’s warranty
- Product conception, design and quality control in Germany
Technical Specifications
General
| Specification |
Detail |
| 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 lifetime (h / 25°C) |
>100,000 |
| Operating temperature up to (°C) |
40 |
Efficiency
| Load Level (230 V) |
Efficiency |
Certification |
| 2% load |
64.4% |
Bronze |
| 10% load |
84.4% |
Bronze |
| 20% load |
88.6% |
Bronze |
| 50% load |
89.7% |
Bronze |
| 100% load |
86.6% |
Bronze |
| 80 PLUS certification |
Bronze |
|
Cooling & Acoustics
| Specification |
Detail |
| 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 |
| Noise level at 10% load dB(A) |
10.4 |
| Noise level at 20% load dB(A) |
10.8 |
| Noise level at 50% load dB(A) |
11.0 |
| Noise level at 100% load dB(A) |
24.2 |
Output
| Specification |
Detail |
| Multi-rail operation (12V) |
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 & Connectors
| Feature |
Detail |
| Modular cables |
No |
| Sleeved cables |
P24 |
| Flat cables |
P4+4, P4, PCIe, drives |
| Maximum cable length (cm) |
55 |
| Cable length to motherboard (cm) |
79 |
| Number of cables |
7 |
Connectors
| Connector Type |
Quantity |
| ATX 20+4-pin (motherboard) |
1 |
| P4+4 (CPU) |
1 |
| P8 (CPU) |
No |
| P4 (CPU) |
1 |
| 12V-2x6 cables |
1 |
| PCIe 6+2-pin (GPU) |
2 |
| PCIe 6-pin (GPU) |
No |
| SATA |
5 |
| PATA |
1 |
| FDD (Floppy) |
No |
Protection Features
| Protection Type |
Available |
| 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 |
Certifications & Environmental Directives
| Certification / Directive |
Status |
| BSMI |
No |
| CB |
No |
| CCC |
No |
| CE |
Yes |
| cRUus |
No |
| cTUVus |
No |
| CU |
Yes |
| FCC |
No |
| RCM |
No |
| TUV |
Yes |
| UKCA |
Yes |
| IRAM |
No |
| ErP |
Yes |
| WEEE |
Yes |
| RoHS |
Yes |
| Triman |
No |
Scope of Delivery
| Item |
Included |
| Thumb screws |
No |
| Screws |
Yes |
| Cable ties |
Yes |
| Velcro cable ties |
No |
| User manual languages |
No |
| OCK slot bracket/jumper |
No |
| SFX-to-ATX adapter |
No |
Casing & Dimensions
| Specification |
Detail |
| Dimensions without cable (L x W x H, mm) |
86 x 150 x 140 |
| Weight (kg) |
1.92 |
| Color |
Black |
Logistics
| Specification |
Detail |
| Package dimensions (L x W x H, mm) |
268 x 195 x 97 |
| Gross weight, package (kg) |
2.3 |
| Pieces per packaging unit |
6 |
| Shipping box dimensions (L x W x H, mm) |
556 x 311 x 218 |
| Gross weight, shipping box (kg) |
14.9 |
Warranty
