Ever tried to build a quiet PC only to hear the PSU whining like a ceiling fan? You need a reliable Power Supply that stays silent while keeping every component safe. The be quiet! System Power 11 550W 80+ Bronze Fully Wired ATX 3.1 PSU, Power Supply delivers stable 550 W on a single +12 V rail, with a temperature-controlled fan that only spins when needed, so you get clean power without the noise.
Why Choose be quiet! Power Supply
A noisy or unstable power source can cause crashes, reduced performance and even damage expensive parts. This issue matters because it directly affects your gaming, work and overall system lifespan. The be quiet! Power Supply solves this by combining quiet fan technology with comprehensive protection circuits, ensuring your build runs smoothly and stays cool under load.
Usages of a 550W Power Supply
Ideal for mid-range gaming rigs, home office PCs and budget-friendly builds that still require solid protection and enough headroom for a modern graphics card, this Power Supply fits ATX 3.1 motherboards and provides all the essential connectors for CPU, GPU and storage.
Benefits of be quiet! Power Supply
You get whisper-quiet operation thanks to the smart fan, so your workspace stays peaceful. The 80 PLUS Bronze rating reduces electricity bills by delivering up to 89.7 % efficiency. Comprehensive over-current, voltage and surge safeguards keep your components safe. A single +12 V rail supplies enough power for current GPUs, and the compact, lightweight design makes installation easy.
Key Features of a 550W Power Supply
- Continuous power output: 550 W. Provides enough juice for modern builds.
- 80 PLUS Bronze certification: 89.7 % efficiency. Lowers running costs.
- Fan: 12 cm rifle bearing. Keeps noise down while cooling effectively.
- Cabling: Non-modular fully wired. All needed cables are ready to plug in.
- +12 V rail: 45.83 A single rail. Supports high-draw graphics cards.
- Noise level: 24.2 dB max. Ensures a quiet environment.
- Weight: 1.92 kg. Easy to handle during installation.
- Dimensions: 140 mm × 86 mm × 150 mm. Fits standard ATX cases.
- Power factor: 0.98. Improves overall power quality.
- ATX version: 3.1 compliance. Works with the latest motherboards.
Specifications
| Power |
| Power protection features |
Over current, Over power, Over voltage, Overheating, Short circuit, Surge & inrush, Under voltage |
| Efficiency |
89.7% |
| Hold time |
16.86 ms |
| Max output current (+5Vsb) |
3 A |
| Max output current (-12V) |
0.3 A |
| Max output current (+5V) |
20 A |
| Max output current (+12V1) |
45.83 A |
| Max output current (+3.3V) |
20 A |
| Combined power (+5Vsb) |
15 W |
| Combined power (-12V) |
3.6 W |
| Combined power (+5V) |
120 W |
| Combined power (+12V) |
550 W |
| Combined power (+3.3V) |
120 W |
| Number of +12V rail(s) |
1 |
| Power factor |
0.98 |
| Input current |
4 A |
| AC input frequency |
50 Hz |
| AC input voltage |
200 - 240 V |
| Total power |
550 W |
| Ports & interfaces |
| Cabling type |
Non-Modular |
| CPU power connector (4+4 pin) |
Yes |
| CPU P4 connector (4-pin) |
1 |
| PCI Express power connectors (12-pin) |
1 |
| PCI Express power connectors (6+2 pin) |
2 |
| Peripheral (Molex) power connectors (4-pin) |
1 |
| Number of SATA power connectors |
5 |
| Motherboard power connector |
20+4 pin ATX |
| Performance |
| Mean time between failures (MTBF) |
100000 h |
| Bearing technology |
Rifle |
| Noise level |
24.2 dB |
| EPS version |
2.92 |
| ATX version |
3.1 |
| 80 PLUS certification |
80 PLUS Bronze |
| Power supply unit (PSU) form factor |
ATX |
| Purpose |
PC |
| Design |
| On/off switch |
Yes |
| Fan speed |
0 - 1800 RPM |
| Number of fans |
1 fan(s) |
| Fan diameter |
12 cm |
| Cooling type |
Active |
| Product colour |
Black |
| Certificates |
| Compliance certificates |
CB, CE, RoHS, TÜV mark, UKCA, WEEE |
| Waste Electrical and Electronic Equipment (WEEE) compliance |
Yes |
| Weight & dimensions |
| Weight |
1.92 kg |
| Height |
140 mm |
| Depth |
86 mm |
| Width |
150 mm |
| Packaging data |
| Package type |
Box |
| Package weight |
2.3 kg |
| Package height |
97 mm |
| Package depth |
268 mm |
| Package width |
195 mm |
| Technical details |
| Sustainability certificates |
ENERGY STAR, ErP |
| Other features |
| Cable ties included |
Yes |
| Screws included |
Yes |
