Power supply Seasonic CORE GC-850 PSU ATX 3.1 850W Gold, PCIe 5.1 - SRP-CGC851-A5A32SF

Seasonic CORE GC-850 is an 850W ATX power supply from the more sensible mid-range segment – powerful enough for serious gaming or workstation use without overspending. You have 80+ Gold certification and up to 90% efficiency, which means less loss in heat and lower power consumption under long load. Support for ATX 3.1 / PCIe Gen 5.0/5.1 prepares you for modern and future graphics cards, including with the new PCIe 5.1 connector. The form factor is standard ATX, so it fits without drama in almost any normal mid/full tower.

What you get is a stable 850W power supply with active PFC and a wide input 100 – 240 VAC, which works confidently both in home and more unstable networks. The PCI-E 5.1 connector + three 6+2-pin PCI-Express provide enough flexibility for modern GPU configurations – from a single powerful card to more complex systems with additional cards. A 120 mm fan takes care of cooling, and the compact length of 140 mm makes cable management easier, especially in tighter cases. It is not modular, so all cables are fixed – fewer contact points, but you need to be more precise with cable management.

• Power 850W – sufficient for high-end gaming configurations with a powerful GPU and many peripherals, without reaching the power supply limit under peak load.
• 80+ Gold certification and up to 90% efficiency – less loss in heat, quieter fan operation, and lower consumption during long gaming or rendering sessions.
• ATX 3.1 / PCIe Gen 5.0/5.1 support – readiness for the new generation of graphics cards and power supply standards, without needing to change the PSU during the next upgrade.
• PCI-E 5.1 x 1 and PCI-Express 6+2 pin x 3 – flexible options for powering modern GPUs and additional cards, with enough connectors for a serious build.
• 20+4 Pin ATX and two 4+4 Pin ATX/EPS – stable power for the motherboard and CPU, including for boards with two EPS connectors.
• SATA x 2 and Molex x 1 – basic set for SSD, HDD, and separate peripheral devices, suitable for a typical gaming or home office build.
• Compact dimensions 140 x 150 x 86 mm and 120 mm fan – easy installation in standard ATX cases and balanced cooling.

It is suitable for gamers and enthusiasts who are building a strong but budget-friendly machine with a powerful GPU and want ATX 3.1 / PCIe 5.1 compatibility. It is also a good choice for workstations with multi-core CPUs and several drives. If you are aiming for an ultra-clean interior with minimal cables, the lack of modularity may annoy you, but it does not functionally limit you.

The combination of 850W power, 80+ Gold efficiency, and ATX 3.1 / PCIe 5.1 makes this power supply a very sensible choice for current and future builds. The balance between power, efficiency, and modern connectors is exactly what you are looking for in a stable long-term configuration.