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