What is the Seasonic FOCUS GX ATX 3.1 PSU, and how is it different?
Seasonic FOCUS GX ATX 3.1 PSU is a series of fully modular power supplies for modern desktop PCs. Its key updates include:
– ATX 3.1 and PCIe 5.1 compliance,
– a standard 12V-2×6 connector,
– the OptiSink™ cooling design.
The unit is 140 mm deep, making it easy to install in compact ATX builds across various configurations. All models are equipped with a 135-mm fan featuring a hydrodynamic bearing and hybrid speed control for better cooling and silent PC performance. Detachable cables allow you to connect only the power lines you need. The series combines compactness with support for high-performance components, and Seasonic offers a ten-year official warranty.
Seasonic FOCUS GX ATX 3.1 PSU and the latest ATX 3.1 and PCIe 5.1 standards
This Seasonic PC power supply complies with ATX 3.1 and PCIe 5.1, taking into account the power requirements of modern components and short-term load spikes. In its comparison of standards, Seasonic notes testing with a pulse of up to 200% of the rated power for 100 microseconds.
This requirement was introduced in ATX 3.0 and carried over to ATX 3.1. It describes a short-term load under specified conditions. Sustained output power is limited by the unit’s rated capacity. Among the changes in ATX 3.1 is an updated 12V-2×6 connector. For users, this means support for modern GPU connections and dynamic load requirements.
Seasonic FOCUS GX: Integrated 12V-2x6 connectivity for modern GPUs.
The Seasonic FOCUS GX ATX 3.1 PSU comes with a native 12V-2×6 cable featuring 16-pin connectors on both ends for a direct connection between the power supply and the graphics card. According to Seasonic’s specifications, this cable supports up to 600 W and uses 16 AWG conductors. It is also compatible with GPUs equipped with previous 12VHPWR cables.
Please note that during installation, both connectors must be fully inserted and secured with the latches before powering on. Leave enough space around the connector to route the cable without sharp bends or lateral tension. Select the power supply’s wattage based on the entire system and the graphics card manufacturer’s recommendations.
Seasonic FOCUS GX ATX 3.1 power supply options: 1000W, 850W, and 750W.
The series offers three power options for various use scenarios and system loads. According to Seasonic’s technical specifications, their +12 V output capabilities vary:
– Seasonic FOCUS GX 1000W power supply: gives up to 996W; has three PCIe 6+2 connectors.
– Seasonic FOCUS GX 850W: gives up to 840W; comes with three PCIe 6+2 connectors.
– Seasonic FOCUS GX 750W: provides up to 744W on the +12 V rail; has two PCIe 6+2 connectors.
All models include a separate 12V-2×6 cable. The choice between the models depends on the power consumption of your components, the necessary connections, and planned upgrades. A higher wattage rating provides more available power for your system.
Seasonic OptiSink™ technology: Improved cooling system and thermal efficiency
Seasonic OptiSink™ technology improves heat dissipation from core system components thanks to a new layout of the printed circuit board and power components. MOSFETs and heat sinks are mounted directly onto the board using SMT technology.
The more compact components free up space for airflow, and optimized thermal paths help dissipate heat from heavily loaded components. Seasonic claims up to 48% more internal space and up to eight times greater thermal conductivity compared to traditional designs. In the FOCUS GX PSU, this allows high-power electronics to be cooled by a compact chassis.
Seasonic FOCUS GX ATX 3.1 PSU: Efficiency, voltage regulation, and power stability.
The FOCUS GX ATX 3.1 PSU is 80 PLUS® Gold certified. For this category at 115 V, an efficiency of at least 90% is required at half load. Separately, the series’ technical specifications specify voltage regulation within ±3% on the +12 V, +5 V, and +3.3 V lines.
Efficiency characterizes the effectiveness of electrical energy conversion, while regulation determines the accuracy of maintaining output voltages. The design also incorporates Japanese electrolytic capacitors rated for 105 °C, as well as protections against overload, overheating, short circuits, overcurrent, overvoltage, and undervoltage.
Who is the Seasonic FOCUS GX ATX 3.1 best for in 2026?
Based on Seasonic FOCUS GX ATX 3.1 PSU specifications, it is suitable for gaming PCs and high-performance home systems, particularly compact builds that support ATX-format power supplies. Its 140 mm depth and fully modular cables are useful in setups where space must be used efficiently. Hybrid fan control includes a fan-off mode under certain low-load conditions. The series is also suitable for upgrading to a graphics card with 12V-2×6 power connectors.
Conclusion: Is the Seasonic FOCUS GX ATX 3.1 the right power supply for your next PC build?
The Seasonic FOCUS GX ATX 3.1 PSU is a strong fit for builds that need a fully modular ATX PSU, modern GPU connectivity, and a compact form factor. The series is available in 1000W, 850W, and 750W, so the right model depends on your overall system configuration.
Start with your GPU’s recommended PSU wattage, then factor in the CPU, other components, available connectors, and the space you have for cable management. Seasonic’s PSU calculator can also give you a useful starting point, especially if you’re planning future upgrades.
The goal is to choose a model that covers your current power needs, provides the right connections, and leaves enough headroom for upgrades such as a more powerful CPU, GPU, or additional storage.
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