Seasonic Focus GX-850 White ATX 3.1
Seasonic Focus GX-850 White ATX 3.1
The Seasonic Focus GX-850 power supply unit, in a white finish, powers modern computer builds with high energy demands. It meets the strict ATX 3.1 and PCIe 5.1 standards, which are crucial for the stable operation of powerful graphics cards and processors. Thanks to its 80 PLUS Gold certification, it achieves high efficiency, reducing both running costs and waste heat production. A fully modular system of braided white cables makes organising the case's interior space easier and promotes efficient airflow. Additionally, its compact 140mm depth simplifies installation, even in smaller cases.
850W
Power
ATX
Form factor
80 PLUS Gold
Certification
Fully
Modularity
Key technologies of the Seasonic Focus GX-850 ATX 3.1 power supply unit, white
- ATX 3.1 and PCIe 5.1 standards handle high power spikes
- 80 PLUS Gold certification means up to 90% efficiency
- Fully modular cable system simplifies PC building
- Digital hybrid control offers three cooling modes
- Compact dimensions make installation easier
- OptiSink technology improves heat dissipation from components
- Six-fold protection prevents damage to connected hardware
Choosing a power supply
When choosing a suitable PC power supply, the key parameter besides the form factor is its power output. This indicates the maximum number of Watts the power supply can continuously deliver to the components in the computer. It is a good idea to use a web calculator to determine the optimal power output based on your chosen components.
Stable performance
The power supply delivers a stable 850W output, covering the energy needs of demanding gaming and workstation setups. The crucial +12V rail has a single-rail design and provides a continuous output of up to 840W. This design delivers stable voltage without fluctuations for the processor and graphics card under heavy load. The +3.3V and +5V rails offer a combined output of 100W for reliably powering hard drives, SSDs, and other peripherals.
Support
Compliance with ATX 3.1 and PCIe 5.1 standards brings full compatibility with the current generation of hardware. The ATX 3.1 specification defines the power supply's ability to handle extreme power excursions. The PSU withstands short-term power spikes of up to 200% of its rated output, which is typical for modern graphics cards. It includes a native 12V-2x6 connector that powers graphics cards with up to 600W without needing any adaptors.
High 80 PLUS Gold efficiency
The 80 PLUS Gold certification confirms 90% efficiency at 50% system load, while at low and full loads it is around 87%. Higher efficiency reduces energy loss converted into waste heat, which leads to lower operating temperatures and less demand on cooling. This allows the fan to run at lower speeds or remain completely off. The electricity savings will be reflected in lower running costs for your build.
Compact design of the Seasonic Focus GX-850
Its ATX form factor with a depth of only 140mm significantly simplifies installation into most computer cases, including more compact Mid-Tower cases. The smaller dimensions leave more free space for cable management and improve airflow in critical areas of the build. The freed-up space makes it easier to access other components, such as drive bays or bottom fans, and speeds up the overall PC building process.
Fully modular white cabling
The fully modular cabling system allows you to connect only the cables that are necessary for your specific build, leaving the rest aside. The white cables with individual braiding contribute to an aesthetically clean look for your computer, especially in cases with a glass side panel. Removing unneeded cables from the case interior not only simplifies assembly but also removes obstacles that hinder optimal air circulation.
Quiet cooling with an FDB fan
A 135mm fan with a fluid dynamic bearing (FDB) takes care of cooling the internal components. This type of bearing uses a layer of oil to stabilise the rotor, which reduces mechanical friction and vibrations. The result is quieter operation and a longer lifespan for the fan, reaching up to 50000 hours of operation. The larger fan diameter also moves a greater volume of air at lower speeds compared to standard 120mm fans.
Digital hybrid control
The digital hybrid fan control operates in three preset modes, which can be easily switched using a button on the back of the power supply. Fanless mode keeps the fan completely off under low load (typically up to 30%), resulting in completely silent operation. Silent mode optimises the fan speed for low noise, while Cooling mode prioritises high cooling performance under demanding and prolonged loads.
OptiSink cooling technology
OptiSink technology uses a redesigned printed circuit board (PCB) layout and smaller heatsinks for more effective heat dissipation. This design increases the internal space of the power supply and promotes better airflow around key components, such as MOSFET transistors. The increased thermal conductivity helps maintain low operating temperatures, which contributes to the reliability of the power supply and allows for its safe installation in any orientation.
Comprehensive set of protections
The power supply includes a set of six key electrical protections for the safe operation of your entire build. These include overvoltage and undervoltage protection, which monitor the stability of the input voltage. They protect connected components from irreversible damage caused by overcurrent, overload, short circuits, and overheating. This comprehensive system acts as a failsafe for the processor, graphics card, and other sensitive hardware.
Practical connector array
The connector array covers the needs of most high-performance builds. It includes one 16-pin 12V-2x6 connector for graphics cards, three separate 8-pin PCIe connectors, and two 8-pin CPU connectors on separate cables. For connecting hard drives and other peripherals, there are eight SATA connectors spread across two cables and three classic Molex connectors. This setup supports multiple graphics cards, processors, and extensive storage.
Connectors
- 1× ATX 24-pin
- 2× CPU 8-pin (4+4)
- 1× 12V-2x6 16-pin
- 3× PCI-E 8-pin (6+2)
- 8× SATA 15-pin
- 3× Molex 4-pin
Package contents
- PC power supply
- Power cable
- Mounting screws
- User manual
- 1× ATX 24-pin (20+4)
- 2× CPU 8-pin (4+4)
- 1× 12V-2x6
- 3× PCI-E 8-pin (6+2)
- 2× SATA
- 1× Molex 4-pin
80 Plus certification in the European market
The 80 Plus certification was created to objectively evaluate the efficiency of PC power supplies. It gives users a simple and clear way to compare different models. On the European market (where 230V is used), there are six levels of 80 Plus certification, each with specific requirements for PC power supplies. Higher energy efficiency primarily means lower energy consumption.
| PC PSU load | Efficiency at 20% load | Efficiency at 50% load | Efficiency at 100% load |
|---|---|---|---|
| 80 PLUS | 82 % | 85 % | 82 % |
| 80 PLUS Bronze | 85 % | 88 % | 85 % |
| 80 PLUS Silver | 87 % | 90 % | 87 % |
| 80 PLUS Gold | 90 % | 92 % | 89 % |
| 80 PLUS Platinum | 92 % | 94 % | 90 % |
| 80 PLUS Titanium | 94 % | 96 % | 94 % |
Specifications
Performance and format
Equipment
Efficiency
Connectors
Cooling system
Dimensions
| Code: | UEfga3a4w |
| Warranty: | 120 months |
| Links: | Producer's Website: |
| Manufacturer information |
Sea Sonic Europe BV, Rietveld 7, 5258 ED Berlicum, Netherlands [email protected] 
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