Power Supply Unit Inter-Tech SFX-300W 300W

The Inter-Tech SFX-300W is a compact SFX power supply unit delivering up to 300 W for desktop systems with specific space and performance requirements. It includes a 20+4 pin ATX motherboard connector, supports AC input from 110–240 V at 50–60 Hz, and features a single 80 mm cooling fan. The unit follows the SFX form factor and is 80 PLUS certified for energy efficiency, measuring 125 mm × 100 mm × 63.5 mm and weighing 0.81 kg.

Advantages

The SFX-300W offers multiple connection options including a PCIe 6+2 pin plug for powering discrete graphics cards with higher consumption. Its 80 PLUS certification ensures improved energy efficiency (over 82%), which reduces power loss and helps lower operating costs. The small SFX size and grey housing make it suitable for compact PC builds where space is limited.

Suitable for

• Small form factor desktop PCs
• Home or office systems with modest power needs
• Builds requiring a PCIe 6+2 pin connector for a mid-range GPU
• Energy-conscious users seeking an 80 PLUS certified PSU

Key specifications

• Total power: 300 W
• Motherboard connector: 20+4 pin ATX
• PCIe connector: 6+2 pin
• AC input: 110–240 V, 50–60 Hz
• Certification: 80 PLUS
• Fan diameter: 80 mm
• Dimensions (W×D×H): 125 × 100 × 63.5 mm
• Weight: 0.81 kg
• Colour: Grey

How to use

Install the SFX-300W into a compatible SFX or SFX-to-ATX adapter bay following the case manufacturer’s mounting instructions. Connect the 20+4 pin ATX cable to the motherboard and attach the SATA/Molex or PCIe 6+2 pin connectors to your drives and graphics card as required. Ensure the AC mains cable is rated for your local voltage and plug it into a grounded outlet. Power on the system and monitor voltages and temperatures during the first boot.

Recommendations

For reliable operation, avoid running the supply continuously near its maximum rated power. Ensure adequate case airflow around the 80 mm fan and use a compatible cable configuration for your components. If you plan to use a high-power graphics card, verify the combined system power draw to remain within the 300 W rating.