be quiet! System Power 11 550W is ATX 3.1 compliant and PCIe 5.1 compatible, 5-year manufacturer's warranty
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be quiet! System Power 11 550W is ATX 3.1 compliant and PCIe 5.1 compatible, 5-year manufacturer's warranty
$81.00
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
- Warranty period: 5 years
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