be quiet! 550W Power Supply
£37.92 inc VAT
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About This Item
- 12 cm rifle-bearing fan with 0-1800 RPM speed control
- ATX 3.1 standard, 550W total output, 89.7% efficiency
- Bronze certification, 24.2 dB noise level, 100,000 h MTBF
- Non-modular cabling with 20+4 pin ATX, 5 SATA, 2 PCIe connectors
- Comprehensive protection: over current, over voltage, overheating, short circuit
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be quiet! System Power 11 550W | Reliable ATX 3.1 Power Supply
The be quiet! System Power 11 550W delivers proven reliability and quiet operation for value-oriented PC builders. Designed with ATX 3.1 compatibility and temperature-controlled fan technology, this 550W Bronze-rated PSU offers dependable performance without compromising on silence or stability.
Key Specifications
| Metric | Spec |
|---|---|
| Power Output | 550W |
| Efficiency | 80 PLUS Bronze |
| ATX Version | 3.1 |
| Cooling | 120mm rifle-bearing fan |
| Noise Level | 24.2 dB |
ATX 3.1 Ready for Modern Components
The System Power 11 550W supports the latest ATX 3.1 standard, ensuring compatibility with next-generation graphics cards and high-performance components. This forward-thinking design provides stable power delivery for demanding gaming rigs and creative workstations, with robust protection against power fluctuations and surges.
Quiet Operation with Smart Cooling
Featuring a temperature-controlled 120mm rifle-bearing fan, this PSU maintains optimal cooling while minimising noise. The fan’s intelligent speed control means it runs at minimal RPM during light loads, keeping your system whisper-quiet. With a noise level of just 24.2 dB, it’s ideal for home offices and media centres where acoustic comfort matters.
Comprehensive Protection for System Safety
Built with multiple protection features including over-current, over-voltage, short-circuit, and overheating safeguards, the System Power 11 550W prioritises your components’ longevity. The 100,000-hour MTBF rating demonstrates be quiet!’s commitment to reliability, giving you confidence in your system’s power foundation.
Box Contents
- be quiet! System Power 11 550W power supply unit
- Mounting screws
- Cable ties
Check before you buy
- Confirm your system requires a 550W power supply
- Verify your case has space for ATX PSU dimensions (150 x 86 x 140mm)
- Check your motherboard’s power connector compatibility (20+4 pin ATX)
- Ensure your GPU’s power requirements match the available PCIe connectors
Frequently Asked Questions
Q: Is this PSU suitable for gaming PCs?
A: Yes, the 550W output and ATX 3.1 compatibility make it suitable for mid-range gaming systems with modern components.
Q: What type of fan does it use?
A: It features a 120mm rifle-bearing fan with temperature-controlled speed for quiet operation.
Q: How many PCIe power connectors are included?
A: The PSU includes two 6+2 pin PCIe connectors and one 12-pin connector for graphics cards.
Q: Is this PSU modular?
A: No, this model features non-modular cabling to keep costs accessible while maintaining reliability.
Q: What efficiency rating does it have?
A: It achieves 80 PLUS Bronze certification with 89.7% efficiency under typical loads.
The Consultant’s Verdict & Warranty
The be quiet! System Power 11 550W represents excellent value for users prioritising reliability and quiet operation in their PC builds. Its ATX 3.1 readiness future-proofs your system, while the comprehensive protection features and proven track record make it a sensible choice for both first-time builders and experienced enthusiasts. Covered by the standard Manufacturer Warranty, this PSU delivers be quiet!’s signature quality at an accessible price point.
| Cooling | |
|---|---|
| Fan diameter | 12 cm |
| Number of fans | 1 fan(s) |
| Fan speed | 0 - 1800 RPM |
| Cooling type | Active |
| Performance | |
| On/off switch | Yes |
| Power supply unit (PSU) form factor | ATX |
| 80 PLUS certification | 80 PLUS Bronze |
| Purpose | PC |
| ATX version | 3.1 |
| EPS version | 2.92 |
| Noise level | 24.2 dB |
| Mean time between failures (MTBF) | 100000 h |
| Bearing technology | Rifle |
| Design | |
| 80 PLUS certification | 80 PLUS Bronze |
| Product colour | Black |
| Fan diameter | 12 cm |
| On/off switch | Yes |
| Number of fans | 1 fan(s) |
| Fan speed | 0 - 1800 RPM |
| Cooling type | Active |
| Power | |
| Total power | 550 W |
| AC input voltage | 200 - 240 V |
| AC input frequency | 50 Hz |
| Input current | 4 A |
| Power factor | 0.98 |
| Combined power (+3.3V) | 120 W |
| Combined power (+12V) | 550 W |
| Combined power (+5V) | 120 W |
| Combined power (-12V) | 3.6 W |
| Combined power (+5Vsb) | 15 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V1) | 45.83 A |
| Max output current (+5V) | 20 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 3 A |
| Power protection features | Over current, Over power, Over voltage, Overheating, Short circuit, Surge & inrush, Under voltage |
| Hold time | 16.86 ms |
| Efficiency | 89.7% |
| Number of +12V rail(s) | 1 |
| Ports & interfaces | |
| Motherboard power connector | 20+4 pin ATX |
| Number of SATA power connectors | 5 |
| Peripheral (Molex) power connectors (4-pin) | 1 |
| PCI Express power connectors (6+2 pin) | 2 |
| CPU P4 connector (4-pin) | 1 |
| CPU power connector (4+4 pin) | Yes |
| Cabling type | Non-Modular |
| PCI Express power connectors (12-pin) | 1 |
| Technical details | |
| Shipping (inner) case width | 31.1 cm |
| Shipping (inner) case length | 55.6 cm |
| Shipping (inner) case height | 21.8 cm |
| Products per shipping (inner) case | 6 pc(s) |
| Sustainability certificates | ENERGY STAR, ErP |
| Compliance certificates | CB, CE, RoHS, TÜV mark, UKCA, WEEE |
| Certificates | |
| Waste Electrical and Electronic Equipment (WEEE) compliance | Yes |
| Compliance certificates | CB, CE, RoHS, TÜV mark, UKCA, WEEE |
| 80 PLUS certification | 80 PLUS Bronze |
| Certification | |
| Waste Electrical and Electronic Equipment (WEEE) compliance | Yes |
| Weight & dimensions | |
| Width | 150 mm |
| Depth | 86 mm |
| Height | 140 mm |
| Weight | 1.92 kg |
| Packaging data | |
| Screws included | Yes |
| Cable ties included | Yes |
| Package depth | 268 mm |
| Package width | 195 mm |
| Package height | 97 mm |
| Package type | Box |
| Package weight | 2.3 kg |
| Packaging content | |
| Screws included | Yes |
| Cable ties included | Yes |
| Logistics data | |
| Shipping (inner) case width | 31.1 cm |
| Shipping (inner) case length | 55.6 cm |
| Shipping (inner) case height | 21.8 cm |
| Products per shipping (inner) case | 6 pc(s) |
| Shipping (inner) case gross weight | 14.9 kg |
| Other features | |
| Screws included | Yes |
| Cable ties included | Yes |
| Identifiers | |
| Distributor SKUs | PSBEQ-BP010EU, 581603 |
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