The Seasonic CORE GX 850W is a fully modular ATX 3.1 power supply designed for modern gaming PCs, workstations and performance systems. With 80 PLUS Gold certification, PCIe 5.1 support and native 12V-2×6 connectivity, it provides efficient and future-ready power delivery. Seasonic's OptiSink thermal design improves heat dissipation and airflow, while the 120mm Hydro Dynamic Bearing fan with Smart and Silent Fan Control balances effective cooling with low operating noise. Its compact 140mm chassis and black braided-pattern modular cables make it ideal for clean, modern system builds.



Key Features

80 PLUS Gold (90% efficiency at 50% system load).

ATX 3.1 and PCIe 5.1 support.

Native 12V-2×6 connectivity for modern graphics cards.

Fully Modular cable design.

120mm Hydro Dynamic Bearing (HDB) fan.

Smart and Silent Fan Control (S²FC).

Seasonic OptiSink thermal design for improved heat dissipation.

Comprehensive OCP, OPP, OTP, OVP, SCP and UVP protection.

7-year manufacturer's warranty.



Full Specification

Model:

CORE GX 850W ATX 3.1



Manufacturer Part Number:

SRP-CGX851-A5A32SF



Output Power:

850W continuous power



Efficiency:

80 PLUS Gold (90% efficiency at 50% system load)



Voltage Rails:

Single +12V rail



+12V Output:

70A / 840W



ATX Form Factor:

ATX/EPS



ATX Standard:

ATX 3.1



PCIe Standard:

PCIe 5.1



Cabling:

Fully Modular



Connectors:

1 x 20+4-pin ATX

2 x 4+4-pin CPU/EPS

1 x 12V-2×6 (12+4-pin)

3 x 6+2-pin PCIe

6 x SATA

3 x 4-pin Molex



Fan:

120mm Hydro Dynamic Bearing (HDB) fan



Fan Speed Control:

Smart and Silent Fan Control (S²FC)



Power Input:

100-240V AC, 50/60Hz



Operating Temperature:

0-50°C



Power Output:

DC outputs: +12V, +5V, +3.3V, -12V and +5VSB



Cable Set:

Individual black cables with braided pattern



Protection:

OCP – Over Current Protection

OPP – Over Power Protection

OTP – Over Temperature Protection

OVP – Over Voltage Protection

SCP – Short Circuit Protection

UVP – Under Voltage Protection



Special Features:

Seasonic OptiSink thermal design, native PCIe 5.1 12V-2×6 connectivity, compact 140mm chassis



Warranty:

7-year manufacturer's warranty



Dimensions without cable (L x W x H), (mm)

140 x 150 x 86