CORE Series
CORE GX ATX 3.1
1000 W
850 W
750 W
650 W
CORE GX ATX 3.1
The updated Seasonic CORE GX ATX 3.1 Series complies with the latest ATX 3.1 and PCIe 5.1 standards and includes four output ranges from 1000 W to 650 W in both black and white colors. Catering to a broad spectrum of PC enthusiasts and system builders, these power supplies provide a fine balance between cost and performance. The 80 PLUS® Gold certified Seasonic’s Core GX line is a fully modular design equipped with black cables featuring a braided pattern. These power supplies are solid performers for a large range of applications, where a 120 mm Hydro Dynamic Bearing fan is combined with Seasonic’s Smart and Silent Fan Control to ensure the optimal cooling performance at the lowest possible noise level. These quality power supplies are backed up by Sea Sonic’s 7-year worldwide manufacturer’s warranty.
CORE GX ATX 3.1 Videos
CORE GX ATX 3.1 Unboxing
A 12V-2x6 to 2x8-Pin Cable Guide
New Seasonic OptiSink™ Design
The overall quality and reliability of the new CORE GX ATX 3.1 Series has been greatly improved by a brand-new PCB (Printed Circuit Board) layout and the implementation of automated surface mount technology during production, which minimizes human production errors.
By using a redesigned PCB combined with smaller MOSFET and heat sink components, the internal space within the power supply was increased to enhance heat dissipation and airflow to result in better component cooling.
The eightfold increase in thermal conductivity at the mounting interface, compared with thermal-pad mounting, keeps the internals of the power supply cooler, eventually leading to improved product quality and more efficient operation.
The redesigned layout of the power supply components and its improved thermal performance creates versatility and allows the power supply to be safely installed in any orientation.
The OptiSink™ design uses a redesigned PCB layout with smaller MOSFET and heat sink components, mounted by automated surface-mount technology. This increases the internal space available for airflow — up to 48% more than the previous generation — and shortens the thermal path between the power components and the heat sink.
Next-Gen and Legacy GPU Cable
Includes native 12V-2x6 and 2× 8-pin adapter for maximum compatibility
Optimized for PCIe 5.1 GPUs
The CORE GX ATX 3.1 power supply features a native 12V-2x6 cable designed for the latest PCIe 5.1 graphics cards. With support for up to 600W of power delivery, this cable ensures safe and stable performance for NVIDIA RTX 40 and 50 Series and future high-end GPUs. Enjoy a clean, efficient setup that’s fully compliant with ATX 3.1 and PCIe 5.1 standards.
Fully compliant with PCIe 5.1 and ATX 3.1 standards
Up to 600W of power
Future-ready while still supporting existing hardware
Full Support for Legacy GPUs
To ensure compatibility with older GPUs, the CORE GX ATX 3.1 includes a 12V-2x6 to 2× 8-pin PCIe adapter cable. It delivers reliable power up and works seamlessly with graphics cards from previous generations. This cable makes it easy to upgrade your PSU without changing your GPU—perfect for users who want next-gen power with legacy support.
Converts 12V-2x6 output to 2× 8-pin PCIe inputs
Ideal for graphics cards from previous generations
Easy to install for users upgrading from older systems
Fully Modular Cables
In Sea Sonic’s patented design feature full modularity comes hand-in-hand with the extensive use of SMD technology to increase the overall performance and reliability of this power supply. The simple and inventive layout scheme helps to attain unsurpassed quality and performance, where efficiency is further enhanced by minimized line resistance, reduced voltage drop and lower impedance. Reduced component count and better space utilization facilitate optimal air flow inside the case and promote heat dissipation and proper cooling.
S2FC - Smart And Silent Fan Control
The intelligent thermal circuit feature is designed to find the optimal balance between the necessity to cool the components and the need to run the power supply in the most silent manner possible.
CORE GX-750 / 850 ATX 3.1
Specifications may change without prior notice.
Specifications may change without prior notice.
Recommended 12V-2×6 Cable Installation
- Your 12V-2×6 cable must be connected with one end to the PSU and the other end to your GPU.
- For safety and stability, ensure both connectors are fully INSERTED, CLICK-LOCKED, and TIGHT before powering on your system.
- DO NOT bend or apply force to the cable after it is plugged into place.
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Datasheet
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Quick Installation Guide
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User Manual
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RoHS Form
Specifications may change without prior notice.
FAQ
CORE GX is the fully modular option in the CORE family, while CORE GC uses fixed cables. GX also goes up to 1000 W and carries a 7-year warranty, compared with a maximum of 850 W and a 5-year warranty for GC. Both are 80 PLUS Gold and support ATX 3.1.
Yes. Along with its native 12V-2×6 connection, CORE GX includes a 12V-2×6 to 2×8-pin PCIe cable for graphics cards that still use traditional PCIe power connectors. This makes it possible to upgrade the PSU without having to change an older GPU at the same time.
The range covers 650 W, 750 W, 850 W and 1000 W. The right model depends on the CPU, graphics card and the rest of the system rather than on one component alone. There is no benefit in automatically choosing 1000 W if your configuration needs much less. If you are unsure, our Wattage Calculator can help you choose the right wattage.
OptiSink™ changes the internal PCB and heatsink layout to improve heat transfer and leave more room for airflow inside the PSU. The aim is better thermal performance without simply relying on larger heatsinks or higher fan speed.
CORE GX is specified for operation from 0 to 50 °C, with linear derating from 100% to 80% between 40 °C and 50 °C.
Yes. Every power cable can be disconnected from the PSU, so you only install what your system needs. If you later add or replace a modular cable, check compatibility first rather than assuming that any Seasonic cable will work with any model.