be quiet! System Power 11 450W PSU
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About This Item
- 450 W ATX 3.1 Bronze power supply with rifle bearing fan
- Active cooling with 12 cm fan, 0-1800 RPM, 19.1 dB noise
- Non-modular cabling with 20+4 pin ATX, 2x PCIe, 5x SATA connectors
- 100 000 h MTBF with over current, over voltage, and short circuit protection
- Compact 150 x 86 x 140 mm form factor for easy PC installation
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be quiet! System Power 11 450W | Bronze Efficiency ATX 3.1 PSU
The be quiet! System Power 11 450W power supply unit 20+4 pin ATX ATX Black delivers reliable, quiet power for budget-conscious PC builders. Built with ATX 3.1 compatibility and a temperature-controlled 120mm fan, it balances performance with near-silent operation—ideal for home and office systems.
Quick specs
| Metric | Spec |
|---|---|
| Total power | 450 W |
| Efficiency rating | 80 PLUS Bronze |
| Cooling | 120mm rifle-bearing fan |
| Noise level | 19.1 dB |
| MTBF | 100,000 h |
| Cabling | Non-modular |
Reliable power with quiet cooling
The System Power 11 450W features a rifle-bearing 120mm fan that adjusts speed between 0 and 1,800 RPM based on system load. This temperature-controlled design keeps noise to a minimum—just 19.1 dB under typical use—while maintaining stable cooling. The single +12V rail delivers clean, consistent power to your components.
Energy efficiency and protection
With 80 PLUS Bronze certification, this PSU operates at up to 89% efficiency, reducing heat and electricity costs. It includes comprehensive protection features: over current, over power, over voltage, overheating, short circuit, surge & inrush, and under voltage protection. The 16.86 ms hold-up time ensures stable operation during brief power fluctuations.
Compact ATX 3.1 form factor
Measuring 150 x 86 x 140 mm, this PSU fits standard ATX cases while supporting the latest ATX 3.1 and EPS 2.92 standards. The non-modular cabling keeps costs down but requires cable management within your case. Five SATA connectors and two PCIe 6+2-pin connectors provide flexibility for most mid-range builds.
Box contents
- be quiet! System Power 11 450W PSU
- Required mounting screws
- Cable ties for cable management
Check before you buy
- Confirm your case has at least 140mm depth for PSU installation
- Verify your GPU requires no more than two 6+2-pin PCIe connectors
- Check your system’s total power draw doesn’t exceed 450W
- Ensure your motherboard uses a 20+4 pin ATX connector
Frequently Asked Questions
Q: Is this PSU compatible with ATX 3.1 motherboards?
A: Yes, it supports ATX 3.1 and EPS 2.92 standards.
Q: Can this power a gaming PC with a dedicated GPU?
A: Suitable for mid-range GPUs; confirm your card’s power requirements first.
Q: Does it have a UK plug?
A: Power input is 200-240V; confirm the included power cable matches your region.
Q: Is the fan noisy under load?
A: No, the rifle-bearing fan operates quietly at 19.1 dB and adjusts speed automatically.
Q: What are the dimensions of this PSU?
A: 150mm wide, 86mm deep, and 140mm high.
The Consultant’s verdict & warranty
The be quiet! System Power 11 450W power supply unit 20+4 pin ATX ATX Black offers excellent value for budget builds, combining quiet operation, reliable power delivery, and modern ATX 3.1 compatibility. Its Bronze efficiency and comprehensive protection make it a sensible choice for everyday PCs. 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 |
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