Chieftec BDF-850C power supply unit 850 W 20+4 pin ATX PS/2 Black

The Chieftec BDF-850C 850 W is a fully‑modular power supply unit from the PROTON Series that uses DC‑to‑DC conversion to provide stable, efficient power for desktop PCs. Certified 80 PLUS Bronze and compliant with ENERGY STAR 5.0 and EU requirements, it delivers 850 W total power with an 85% efficiency rating, a 20+4 pin ATX motherboard connector and an active cooling solution with a 140 mm fan. The compact housing measures 150 x 140 x 87 mm and comes in black.

Advantages

The DC‑to‑DC design increases voltage stability and improves overall efficiency, contributing to longer component lifetime. A fully‑modular cable system simplifies installation and cable management. 80 PLUS Bronze certification confirms reduced energy losses and compliance with ENERGY STAR 5.0 and higher requirements.

Suitable for

• Gaming and high‑performance desktop PCs requiring up to 850 W
• System builders who prefer a fully‑modular PSU for cleaner cable routing
• Upgrading older systems to improve power efficiency and component longevity

Key specifications

• Total power: 850 W
• Efficiency: 85% (80 PLUS Bronze)
• Motherboard connector: 20+4 pin ATX
• Fan diameter: 140 mm (active cooling)
• AC input: 115–230 V, 50–60 Hz
• Dimensions (W x D x H): 150 x 140 x 87 mm
• Colour: Black

How to use

Install the Chieftec BDF-850C into a compatible PC case using standard PSU mounting points. Connect the 20+4 pin ATX cable to the motherboard and attach modular cables to components (GPU, drives, peripherals) as required. Ensure the AC input matches local mains voltage (115–230 V) and secure all connections before powering on the system. Maintain airflow around the 140 mm fan to allow proper cooling.

Recommendations

Use the fully‑modular cabling to attach only the required connectors to reduce clutter and improve case airflow; verify system power draw to ensure the 850 W capacity meets peak load requirements.