Be Quiet! System Power 11 450W PSU
£36.20 inc VAT
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About This Item
- 450W power supply with ATX 3.1 compatibility
- 12 cm rifle bearing fan with 0-1800 RPM speed control
- Bronze efficiency rating with 89% efficiency
- Non-modular cabling with 20+4 pin ATX motherboard connector
- Five SATA and two PCIe 6+2 pin power connectors
- Comprehensive protection including over current, over voltage, and short circuit
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be quiet! System Power 11 450W | Quiet & Reliable ATX Power Supply
The be quiet! System Power 11 450W power supply unit delivers proven reliability and quiet operation for value-conscious PC builders. Designed with ATX 3.1 compatibility, a temperature-controlled 120mm fan, and an impressively low standby power draw, this unit offers excellent performance without breaking the bank.
Slim Specs Table
| Metric | Spec. |
|---|---|
| Total Power | 450 W |
| Efficiency Rating | 80 PLUS Bronze (89%) |
| Noise Level | 19.1 dB |
| Fan Diameter | 120 mm |
| ATX Version | 3.1 |
Quiet Operation Without Compromise
The System Power 11 450W features a temperature-controlled 120mm fan that adjusts its speed between 0-1800 RPM based on system load. This intelligent cooling system maintains optimal temperatures while keeping noise levels to an absolute minimum—just 19.1 dB under typical operation. The rifle bearing technology ensures smooth, long-lasting performance with minimal vibration, making this ideal for home offices, media centers, or any environment where silence matters.
Built for Modern PC Systems
With ATX 3.1 and EPS 2.92 compliance, this power supply is ready for today’s demanding components. The single +12V rail delivers up to 37.5A, providing stable power delivery for mid-range gaming rigs and productivity systems. Five SATA connectors, two PCIe 6+2 pin connectors, and comprehensive protection features including over-current, over-voltage, and short-circuit protection ensure compatibility with a wide range of builds while keeping your components safe.
Exceptional Reliability You Can Trust
Quality components and rigorous testing back the System Power 11’s reputation for dependability. With a Mean Time Between Failures (MTBF) rating of 100,000 hours and comprehensive power protection features, this unit is built to last. The 80 PLUS Bronze certification guarantees at least 89% efficiency across typical loads, reducing heat output and lowering your electricity costs over time.
Box Contents
- be quiet! System Power 11 450W power supply unit
- Power cable (UK plug confirmation required)
- Mounting screws
- Cable ties for cable management
Check before you buy
- Confirm the power supply includes a UK 3-pin plug for your region
- Verify your system’s total power draw is within the 450W capacity
- Check that your case has sufficient space for the 150mm x 86mm x 140mm dimensions
- Confirm your motherboard uses a 20+4 pin ATX connector (standard)
Frequently Asked Questions
Q: Is this power supply suitable for gaming PCs?
A: Yes, the 450W capacity and dual PCIe connectors make it suitable for mid-range gaming systems with dedicated graphics cards.
Q: What efficiency rating does this PSU have?
A: It carries an 80 PLUS Bronze certification with 89% efficiency across typical loads.
Q: Does this unit have modular cables?
A: No, this is a non-modular power supply with all cables permanently attached.
Q: What are the dimensions of this power supply?
A: The unit measures 150mm x 86mm x 140mm, which fits standard ATX cases.
Q: What protection features are included?
A: It includes over-current, over-power, over-voltage, overheating, short-circuit, surge & inrush, and under-voltage protection.
The Consultant’s verdict & warranty
The be quiet! System Power 11 450W power supply unit offers exceptional value for users building reliable, quiet PCs without premium pricing. Its combination of ATX 3.1 compatibility, low noise operation, and comprehensive protection features makes it perfect for home offices, media centers, and mid-range 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 | 19.1 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 | 450 W |
| AC input voltage | 200 - 240 V |
| AC input frequency | 50 Hz |
| Input current | 4 A |
| Power factor | 0.98 |
| Combined power (+3.3V) | 110 W |
| Combined power (+12V) | 450 W |
| Combined power (+5V) | 110 W |
| Combined power (-12V) | 3.6 W |
| Combined power (+5Vsb) | 15 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V1) | 37.5 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% |
| 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 power connector (4+4 pin) | Yes |
| Cabling type | Non-Modular |
| 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 | 1.7 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 | 2.1 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 | 13.6 kg |
| Other features | |
| Screws included | Yes |
| Cable ties included | Yes |
| Identifiers | |
| Distributor SKUs | PSBEQ-BP009EU, 581572 |
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