be quiet! SFX Power 3 450W BN321 - 80 PLUS Bronze Non-Modular Compact PSU (Boxed)
Compact 450W SFX PSU with 80 PLUS Bronze efficiency, non-modular design, and ultra-quiet 80mm fan (33.8dB max). Ideal for mini-ITX and media center builds.
Please Note
The website is currently being actively developed, you are welcome to place the order and in 99% of the cases your order will be processed as usual, but in some cases there may be a delay or the price may change. We will notify you if there are any issues.
Discontinued
This item was discontinued and currently is not available for order on our website. The item may become available soon. Please contact us if you need more information regarding the upcoming arrivals.
| PSU (Power Supplies) - Wattage | 400 - 499 W |
|---|---|
| PSU (Power Supplies) - Efficiency Rating | 80 Plus Bronze |
| PSU (Power Supplies) - Color | Black |
| PSU (Power Supplies) - Modularity | Non-modular |
| PSU (Power Supplies) - PCIe GPU Connectors | 2x 8/6 pins |
| PSU (Power Supplies) - Length | Up to 140 mm |
| PSU (Power Supplies) - EPS CPU Connectors | 1x 4+4pin EPS/ATX12V |
The be quiet! SFX Power 3 450W (BN321) is a compact power supply engineered for mini-ITX and small form factor PC systems. Delivering 450W of continuous power with a 500W peak capacity, this PSU provides reliable performance for systems with powerful PCIe graphics cards while maintaining exceptional quietness. The high-quality 80mm temperature-controlled fan operates at a maximum of 33.8dB(A), ensuring silent operation even under full load.
With 80 PLUS Bronze certification and up to 89.3% efficiency, the SFX Power 3 minimizes power waste and reduces electricity costs. The non-modular cable design simplifies installation in compact cases, while the SFX12V 3.42 form factor (125mm × 100mm × 64mm) fits seamlessly into space-constrained builds. Featuring comprehensive protection against overcurrent, overvoltage, short circuits, and other electrical faults, this PSU is built for reliability and longevity with a 100,000-hour MTBF rating.
Key features include:
- 450W continuous / 500W peak power output
- 80 PLUS Bronze efficiency certification
- Ultra-quiet 80mm rifle-bearing fan (max 33.8dB)
- Non-modular fixed cables for compact installations
- 2x PCIe 6+2 pin connectors for graphics cards
- 1x 4+4 pin EPS connector for CPU power
- 3x SATA and 2x Molex connectors
- Active PFC and comprehensive protection features
- RoHS and WEEE compliant
| Continuous Power Output | 450 W |
| Peak Power Output | 500 W |
| Form Factor | SFX12V 3.42 |
| EPS Version | 2.92 |
| Efficiency Rating | 80 PLUS Bronze (85.9% typical, up to 89.3%) |
| AC Input Voltage | 100 - 240 V |
| AC Input Frequency | 50 - 60 Hz |
| Input Current | 6 A @ 110V / 2.5 A @ 220V |
| Power Factor | >0.98 at 100% load |
| Power Factor Correction Type | Active |
| +3.3V Rail Output | 85 W max, 16 A max |
| +5V Rail Output | 85 W max, 16 A max |
| +12V Rail Output | 450 W max, 37.5 A max |
| -12V Rail Output | 0.3 A max |
| +5V Standby Output | 2.5 A max |
| Hold-up Time | 21 ms |
| Standby Power Consumption | <0.11 W |
| Protection Features | Overcurrent, Overvoltage, Undervoltage, Short Circuit, Overpower |
| Motherboard Connector | 20+4 pin ATX |
| Motherboard Cable Length | 35 cm |
| EPS CPU Connector | 1x 4+4 pin |
| PCIe GPU Connectors | 2x 6+2 pin |
| PCIe Cable Length | 55 cm |
| SATA Connectors | 3x |
| SATA Cable Lengths | 300 mm, 450 mm, 600 mm |
| Molex (4-pin) Connectors | 2x |
| Molex Cable Lengths | 300 mm, 450 mm |
| Floppy Connector | 1x |
| Floppy Cable Length | 60 cm |
| Cabling Type | Non-Modular |
| Fan Size | 80 mm |
| Fan Type | High-quality temperature-controlled |
| Bearing Technology | Rifle |
| Motor Technology | 4-pole fan motor |
| Maximum Fan Speed | 2366 RPM |
| Noise Level @ 10% Load | 13.2 dB(A) |
| Noise Level @ 20% Load | 13.2 dB(A) |
| Noise Level @ 50% Load | 13.2 dB(A) |
| Noise Level @ 100% Load | 33.8 dB(A) |
| Topology | DC/DC |
| Modern Standby Support | Yes |
| MTBF | 100,000 hours |
| Color | Black |
| Cooling Type | Active |
| On/Off Switch | Yes |
| Unit Width | 125 mm |
| Unit Depth | 100 mm |
| Unit Height | 64 mm |
| Unit Weight | 890 g |
| Safety Certifications | CE, CB, TÜV, CU |
| Compliance Standards | RoHS, WEEE |
| Sustainability Certifications | ENERGY STAR, ErP |
| HS Code | 84733020 |