Be Quiet! SFX Power 3 300W - Compact Power Supply for Small Form Factor PCs

The Be Quiet! SFX Power 3 300W delivers reliable continuous power in a compact SFX form factor, making it the ideal choice for mini-ITX and media center builds. This 80+ Bronze certified PSU combines efficiency, quiet operation, and German engineering quality.

300W Continuous Power with Strong 12V Rail

Designed to deliver 300 watts of steady continuous power, this PSU ensures stable operation even under demanding loads. The single 12V rail design provides consistent power delivery, while the included 6+2 pin PCIe connector supports modern graphics cards. Multiple protection mechanisms including over current, over voltage, under voltage, short circuit, and over power protection keep your components safe.

Quiet 80mm Rifle Bearing Fan

The high-quality temperature-controlled 80mm fan with rifle bearing technology operates at just 14.4 dB(A) at 20% and 50% load, reaching a maximum of 29.4 dB(A) only at full load. This makes the SFX Power 3 300W one of the quieter options for compact PC builds where noise levels matter.

80+ Bronze Efficiency Certification

With 80+ Bronze certification, this PSU achieves up to 89.2% efficiency at 50% load (230V), reducing energy waste and heat generation. Efficiency ratings of 84.4% at 20% load and 88.1% at 100% load ensure power-saving operation across the entire load spectrum.

Comprehensive Connectivity

The fully wired cable design includes black sleeved or flat cables up to 60cm in length, providing sufficient reach for small form factor cases. Connectors include: 1x ATX 20+4-pin motherboard, 1x P4 CPU, 1x PCIe 6+2-pin for GPU, 3x SATA, 2x PATA, and 1x FDD.

German Engineering and Quality

Conceived, designed, and quality controlled in Germany, the SFX Power 3 300W meets the latest SFX12V V3.42 and EPS 12V 2.92 standards. With active PFC, 100-240V AC input compatibility, and a 100,000-hour MTBF rating, this PSU is built for long-term reliability. Backed by a three-year manufacturer's warranty.

Compact Dimensions

Measuring just 100 x 125 x 64mm and weighing 0.84kg, this SFX power supply fits easily into compact cases while delivering full-featured performance for small form factor systems.

Compact and Silent Energy

• Strong 12V rail with 300W of continuous power
• 6+2 pin PCIe connector for GPU support
• High-quality temperature-controlled 80mm fan for quiet operation of max. 29.4dB(A)
• Sleeved or flat black cables up to 60cm
• 80 PLUS® Bronze efficiency (up to 89.2%)
• Meets the latest safety and efficiency requirements
• Three-year manufacturer's warranty
• Product conception, design and quality control in Germany

Description

Specification

• Form Factor: SFX
• Series: Be Quiet! SFX Power 3
• Wattage: 300 W
• Modular: Fully Wired
• Compatibility: SFX12V V3.42 & EPS 12V 2.92
• #Hide#Wattage Range: 300 - 400W
• Connectors: 1 x ATX-Motherboard (20+4-pin)
  1 x P4 (CPU)
  1 x PCI-e 6+2-pin (GPU)
  2 x PATA
  3 x SATA
  1 x FDD (Floppy)
• Rail Design: Single 12V rail
• AC Input: AC 100-240 V
• PFC: Active PFC
• Fan Type: High-quality temperature-controlled 80mm fan
• Fan Bearing: Rifle Bearing
• Noise: dB(A) at 20% load: 14.4
  dB(A) at 50% load: 14.4
  dB(A) at 100% load: 29.4
• Max Certification: Bronze
• Efficiency: "80+ Bronze
  230V, 20% load: 84.4%
  230V, 50% load: 89.2%
  230V, 100% load: 88.1%"
• MTBF: "100,000 hours"
• Protection: Over current
  Over voltage
  Under voltage
  Short circuit
  Over power
• Additional Features: See Overview
• Package Contents: PSU
  Screws
  Cable ties
  Manual
• Weight/Dimensions: 0.84 kg
  (L x W x D) 100 x 125 x 64 mm
• Package Weight: 1.1900 kg
• Warranty: 3 Years