Power supply unit Seasonic CORE GC-850 ATX 3.1 850 W 24-pin ATX Fully-modular 80 PLUS Gold Black

The Seasonic CORE GC-850 ATX 3.1 is an 850 W fully modular power supply designed for desktop PCs and system builders. Compliant with ATX 3.1 and PCIe 5.1 standards, this 80 PLUS Gold certified unit features a 24-pin ATX motherboard connector, a 120 mm active fan, and braided black cables. The CORE GC-850 incorporates Seasonic’s OptiSink PCB layout improvements and automated surface-mount production to improve heat dissipation, reliability and long-term efficiency while supporting both next-generation and legacy GPU power connections.

Advantages

The CORE GC-850 offers efficient 80 PLUS Gold performance, fully modular cabling for simplified cable management, and a 120 mm Hydro Dynamic Bearing fan with Smart and Silent Fan Control (S2FC) for optimized cooling and reduced noise. The redesigned PCB and smaller MOSFET and heatsink components increase internal airflow and heat dissipation, improving component temperatures and overall reliability. Includes native 12V-2x6 and 2×8-pin GPU compatibility and is backed by a 7-year manufacturer’s warranty.

Suitable for

• High-performance gaming PCs using next-gen or legacy GPUs
• Workstations and content-creation systems requiring stable 850 W power
• Custom builds where fully modular cabling and compact internal layout are desired
• System builders and PC enthusiasts seeking 80 PLUS Gold efficiency

Key specifications

• Total power: 850 W
• AC input voltage: 100 - 240 V, 50/60 Hz
• Motherboard connector: 24-pin ATX
• 80 PLUS certification: 80 PLUS Gold
• Cabling: Fully modular; braided black cables
• Cooling: Active 120 mm Hydro Dynamic Bearing fan with S2FC
• Compatibility: ATX 3.1 and PCIe 5.1 standards; native 12V-2x6 and 2×8-pin GPU support
• Color: Black
• Manufacturer warranty: 7 years

How to use

Install the CORE GC-850 into a compatible ATX case following standard PSU mounting orientation and grounding practices. Connect the 24-pin ATX motherboard cable and required CPU, PCIe, SATA and peripheral cables using the fully modular connectors included. Ensure the AC input range (100–240 V, 50/60 Hz) matches your mains supply and secure the AC cable. Monitor airflow and cable routing to maintain adequate ventilation inside the case.

Recommendations

For reliable operation, allow at least one case fan for intake or exhaust in addition to the PSU fan, keep cables tidy to avoid obstructing airflow, and verify GPU power connector type before installation. Use the unit within its specified input range and load capacity, and follow the 7-year warranty service procedures provided by Seasonic for support.