Power supply unit Seasonic CORE BC-850 ATX 3.1 850 W, 20+4 pin ATX, 80 PLUS Bronze, black

The Seasonic CORE BC-850 is an ATX 3.1 power supply delivering 850 W of continuous power in a compact 140 mm housing with a durable scratch-resistant black finish. Designed for everyday builders and gamers, the unit features 80 PLUS Bronze efficiency, an active 120 mm HDB cooling fan and Smart and Silent Fan Control (S2FC) to balance quiet operation with effective cooling. The CORE BC-850 includes native 12V-2x6 and 2×8 PCIe cables for broad GPU compatibility and standard 20+4 pin ATX motherboard connectivity.

Advantages

The CORE BC-850 combines Seasonic engineering with ATX 3.1 compliance to provide stable, reliable power for standard desktop builds. Its 80 PLUS Bronze certification improves energy efficiency under typical loads, while S2FC adjusts fan speed dynamically to reduce noise during light use and increase cooling when required. The included next‑gen and legacy GPU cables simplify compatibility with current and older graphics cards.

Suitable for

• Standard mid‑tower and full‑tower desktop PCs
• Everyday gaming systems and mainstream builds
• Upgrades requiring ATX 3.1 compatibility and PCIe Gen 5.1 GPU cables
• Systems that prioritize a balance of quiet operation and reliable cooling

Key specifications

• Total power: 850 W
• Input: 100 - 240 V, 50/60 Hz
• Motherboard connector: 20+4 pin ATX
• 80 PLUS Bronze efficiency
• Fan: 120 mm HDB (active)
• Color: Black

How to use

Install the CORE BC-850 into a compatible ATX case following the motherboard and case manufacturer instructions. Connect the 20+4 pin ATX cable to the motherboard and attach the provided CPU and PCIe cables to the appropriate connectors on the motherboard and graphics card(s). Ensure all connections are secure and routed to avoid obstructing airflow. After connecting power to the PSU and to the wall outlet, power on the system and verify stable operation and fan behavior under different loads.

Recommendations

Use the native 12V-2x6 and 2×8 PCIe cables included with the CORE BC-850 for maximum GPU compatibility; avoid adapters unless specified by the GPU manufacturer. Place the PSU with sufficient ventilation and keep dust buildup minimal to maintain cooling efficiency and long-term reliability.