Be Quiet! 300W SFX Power 3 PSU, Small Form Factor, Rifle Bearing Fan, 80+ Bronze, Continuous Power


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SKU: BN320 Categories: ,

Compact and Silent Energy

SFX Power 3 300W, the first choice compact PSU for mini and media PCs with 80 PLUS® Bronze and PCIe graphics card support. SFX Power 3 300W offers the ideal combination of power, quietness and reliability.
  • 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

Strong 12V Rail
For a stable PCIe graphics support
A PCIe connector provides power for a demanding graphics card. Safety protections defend against overcurrents, over- and undervoltages, short circuits and overloads, thus keeping your valuable components safe.
300 Watts Continuous Power Output
Ensures a steady and reliable operation
SFX Power 3 can deliver 300W of continuous power. This ensures a steady and reliable operation even when your PC meets an unexpectedly heavy load.


Quiet and Efficient Operation
For mini or media PCs
The high-quality temperature-controlled 80mm fan allows quiet operations of max. 29.4dB(A). The 80 PLUS Bronze certification with an efficiency rating of up to 89.2% is convincing evidence of this PSU’s power saving operation.




  • Form Factor: SFX
  • Modular: Fully Wired
  • Series: Be Quiet! SFX Power 3
  • Compatability: SFX12V V3.42 & EPS 12V 2.92
  • Wattage: 300 W
  • 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
  • 80+ Certification: 80+ Bronze
  • Efficiency: “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
  • Features: See Overview
  • Package Contents: PSU
    Cable ties
  • Weight/Dimensions: 0.84 kg
    (L x W x D) 100 x 125 x 64 mm
  • Package Weight: 1.1900 kg
  • Warranty: 3 Years
Weight1.1900 kg
Form Factor


80+ Certification

80+ Bronze




3 Years

Package Weight

1.1900 kg


0.84 kg (L x W x D) 100 x 125 x 64 mm


See Overview


Over currentOver voltageUnder voltageShort circuitOver power


"100, 000 hours"


"230V, 20% load


dB(A) at 20% load


Fully Wired

Fan Bearing

Rifle Bearing

Fan Type

High-quality temperature-controlled 80mm fan


Active PFC

AC Input

AC 100-240 V

Rail Design

Single 12V Rail


1 x ATX-Motherboard (20+4-pin)1 x P4 (CPU)1 x PCI-e 6+2-pin (GPU)2 x PATA3 x SATA1 x FDD (Floppy)


300 W


SFX12V V3.42 & EPS 12V 2.92


Be Quiet! SFX Power 3

Package Contents

PSUScrewsCable tiesManual


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