Seasonic FOCUS GX V4 850W 80+ Gold ATX 3.1 Modular PSU
Seasonic
Seasonic FOCUS GX V4 850W 80+ Gold ATX 3.1 Modular PSU
The Seasonic FOCUS GX V4 850W 80+ Gold ATX 3.1 Modular PSU is built for enthusiasts and system builders who need reliable, efficient power for high-demand graphics cards and processors. Compliant with the latest ATX 3.1 and PCIe 5.1 standards, it includes a native 12V-2×6 connector and is ready for current-generation GPUs from both Nvidia and AMD. A redesigned PCB with improved thermal performance and a 10-year warranty make it a long-term foundation for a demanding build.
Why this product
ATX 3.1 & PCIe 5.1 ready out of the box
It ships with a native 12V-2×6 (12VHPWR) cable, so there is no need for adapters when connecting the latest high-power graphics cards.
80 PLUS Gold: 90% efficiency at 50% load
Certified 80 PLUS Gold efficiency reduces wasted energy as heat, keeping running costs and internal temperatures lower during typical workloads.
Eightfold increase in heat dissipation
A redesigned PCB with smaller MOSFET and heat sink components frees internal space, dramatically improving airflow and component cooling compared to previous versions.
Three-stage Digital Hybrid Fan Control
Fanless Mode, Silent Mode, and Cooling Mode allow the 135mm FDB fan to stay completely off under light loads, keeping the system quiet when full cooling is not needed.
Fully modular cabling for cleaner builds
Every cable detaches at the PSU end, so unused cables are not stuffed behind a shroud — only the cables a build actually needs are installed.
10-year warranty from Seasonic
One of the longest standard warranties available on a consumer PSU, covering the unit for the typical lifespan of multiple PC builds.
- Wattage850W
- Efficiency80 PLUS Gold (90% at 50% load)
- Form FactorATX
- ModularFully Modular
- ATX / PCIe StandardATX 3.1 / PCIe 5.1
- Depth140mm
- Warranty10 Years
- Fan135mm Fluid Dynamic Bearing (FDB)
- SKUSEA-770
- EAN4711173878438
- Compatible with Nvidia RTX 30, 40, and 50 Super series GPUs via the native 12V-2×6 connector.
- Compatible with AMD RX 9000 Series GPUs.
- Fits standard ATX cases — the 140mm depth is compact enough for most mid-tower and full-tower ATX enclosures.
- Works with ATX 3.1 motherboards; also backward-compatible with ATX systems requiring a 24/20-pin motherboard connector.
- Can be safely installed in any orientation thanks to the redesigned PCB and improved thermal performance — verify your case's PSU bay orientation before purchasing.
- Not a SFX or SFX-L form factor unit — will not fit small-form-factor cases that require a compact PSU.
Best for
- High-end GPU builds — the native 12V-2×6 connector and 850W output are designed to power the latest generation of demanding graphics cards without adapters.
- Noise-sensitive users — the fanless and silent modes keep the system nearly inaudible during light to moderate workloads.
- Long-term or multi-build ownership — the 10-year warranty and improved PCB reliability make it suitable for buyers who plan to carry the PSU across multiple system builds.
- Builders prioritising cable management — the fully modular design means only the cables actually needed are routed, simplifying installation and improving airflow.
- Efficiency-conscious builders — 90% efficiency at 50% load reduces wasted energy during everyday use, lowering electricity costs over time.
Trade-offs
- Small-form-factor builds — at 140 × 150 × 86 mm, it is a standard ATX unit and will not fit SFX or SFX-L cases.
- Budget-focused builds — a fully modular, 80 Plus Gold ATX 3.1 unit with a 10-year warranty carries a higher price point than basic Bronze-rated alternatives.
- Low-power or entry-level systems — 850W is more capacity than most office PCs or budget gaming rigs will ever use; a lower-wattage unit would be more cost-effective for those builds.
Following the well-established legacy of the Seasonic FOCUS Series, the FOCUS GX Series has been upgraded to comply with the ATX 3.1 and PCIe 5.1 standards. It offers a complete range of power supplies from 750W to 1000W, all within a compact 140mm depth. Each unit features a 135mm fan, a 12V-2×6 cable, and our new OptiSink technology. These units are designed to be perfect allies in powering the latest high-power graphics cards and processors available on the market.
The FOCUS GX ATX 3.1 Series achieves 80 PLUS® Gold certification with its 90% efficiency at 50% system load.
The overall quality and reliability of the FOCUS v4 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 heat dissipation keeps the internals of the power supply cooler, eventually leading to improved product quality, long-term reliability, 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 industry's first, Seasonic patented, advanced three-phased thermal control achieves optimal between silence and cooling. This Digital Hybrid Fan Control functions in three operational stages: Fanless Mode, Silent Mode, and Cooling Mode.
High performance Fluid Dynamic Bearing (FDB) fans are designed to take advantage of the impact absorbance effects of oil. They are extremely reliable and generate considerably less operating noise and heat than ball bearing fans.
General
| Brand | Seasonic |
|---|---|
| Model | FOCUS-GX-850-V4 (Ref. SRP-FGX851-A5A32SF) |
| Wattage | 850W |
| Form Factor | ATX |
| Colour | Black |
| Dimensions (L × W × H) | 140 × 150 × 86 mm |
Power & Efficiency
| Efficiency Rating | 80 PLUS Gold (90% at 50% load) |
|---|---|
| ATX Compliance | ATX 3.1 |
| PCIe Compliance | PCIe 5.1 |
| MTBF | 50,000 hours |
| Capacitors | Premium Japanese, rated up to 105°C / 221°F |
Connectivity
| Modular | Fully Modular |
|---|---|
| Motherboard Connector | 1 × 24/20-pin |
| CPU / PCIe Connectors | 5 × CPU/PCIe connectors |
| PCIe 5.1 / 12V-2×6 Connector | 1 × PCIe 5.1 (12VHPWR / 12V-2×6) |
| SATA / Molex Connectors | 4 × SATA/Molex |
Cooling & Warranty
| Fan Size & Type | 135mm Fluid Dynamic Bearing (FDB) |
|---|---|
| Fan Control | Digital Hybrid — Fanless, Silent, and Cooling modes |
| Thermal Technology | OptiSink — redesigned PCB with eightfold increase in heat dissipation |
| Warranty | 10 Years |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.