be quiet! 550W Power Supply
£42.09 inc VAT
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About This Item
- ATX 3.1 compatible power supply with 550W output
- Bronze efficiency rating with 89.7% efficiency
- 12cm rifle bearing fan with 0-1800 RPM speed control
- Non-modular cabling with 20+4 pin ATX motherboard connector
- Over current, over power, over voltage, overheating, short circuit, surge & inrush, under voltage protection
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be quiet! System Power 11 550W | Reliable ATX 3.1 PSU
The be quiet! System Power 11 550W power supply unit 20+4 pin ATX ATX Black delivers proven reliability and quiet operation for value-conscious PC builders. Designed for modern systems, it offers ATX 3.1 compatibility and temperature-controlled fan cooling while maintaining efficient 80 PLUS Bronze certification.
Slim Specs Table
| Metric | Spec. |
|---|---|
| Total Power | 550 W |
| Efficiency | 89.7% |
| Fan Type | 120 mm Rifle bearing |
| Noise Level | 24.2 dB |
| MTBF | 100,000 hours |
Proven Reliability for Everyday Builds
Built with reliability at its core, the System Power 11 550W features a Mean Time Between Failures (MTBF) of 100,000 hours, ensuring long-term stability for daily computing tasks. The single +12V rail delivers consistent power to demanding components, while comprehensive protection features safeguard against overcurrent, overvoltage, overheating, and short circuits. This PSU is engineered to handle modern PC components without compromise.
Quiet Operation with Smart Cooling
The temperature-controlled 120 mm fan with Rifle bearing technology ensures silent operation during typical workloads. Fan speed adjusts automatically between 0-1800 RPM based on system temperature, keeping noise levels at just 24.2 dB under normal conditions. This intelligent cooling system means you’ll barely notice the PSU is running, making it ideal for quiet home offices or media centers.
Complete Modern Compatibility
Supporting ATX 3.1 and EPS 2.92 standards, this PSU is ready for current and next-generation hardware. The 20+4 pin ATX motherboard connector, 4+4 pin CPU connector, and multiple PCIe 6+2 pin outputs accommodate most modern builds. With five SATA power connectors and one Molex peripheral connector, it provides ample connectivity for storage drives and accessories without requiring adapters.
Check before you buy
- Confirm your case has sufficient space for 150 mm × 86 mm × 140 mm dimensions
- Verify your GPU requires no more than 45.83 A on the +12V rail
- Check if your region requires specific power cable configurations
- Confirm your motherboard uses standard 20+4 pin ATX power connector
Frequently Asked Questions
Q: Is this PSU compatible with ATX 3.1 motherboards?
A: Yes, it supports ATX 3.1 standard for compatibility with modern systems.
Q: How many PCIe power connectors does it have?
A: It includes two 6+2 pin PCIe connectors plus one 12-pin connector.
Q: Is the cabling modular or fixed?
A: The System Power 11 550W uses non-modular cabling.
Q: What efficiency rating does this PSU achieve?
A: It maintains 89.7% efficiency with 80 PLUS Bronze certification.
Q: Does it include mounting screws?
A: Yes, screws are included in the package.
The Consultant’s verdict & warranty
The be quiet! System Power 11 550W power supply unit 20+4 pin ATX ATX Black represents excellent value for budget-conscious builders who refuse to compromise on reliability and quiet operation. With its ATX 3.1 compatibility, efficient cooling, and comprehensive protection features, it delivers dependable performance for everyday computing and light gaming systems. Covered by the standard Manufacturer Warranty.
| 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 |
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