Seasonic FOCUS GX V4 850W White ATX 3.1 80 Plus Gold PSU
Seasonic
Seasonic FOCUS GX V4 850W White ATX 3.1 80 Plus Gold PSU
The Seasonic FOCUS GX V4 850W White is a fully modular power supply built for modern high-end systems running the latest graphics cards and processors. It meets ATX 3.1 and PCIe 5.1 standards with 80 Plus Gold efficiency, runs nearly silent under light loads, and fits compact cases with its 140mm depth.
Why this product
ATX 3.1 and PCIe 5.1 ready
Compliant with the latest standards for next-generation GPUs and CPUs, including the 12V-2×6 connector for high-power graphics cards.
Fanless operation up to 30% load
Seasonic's patented Hybrid Silent Fan Control keeps the unit completely silent during light workloads, switching to active cooling only when needed.
OptiSink heat dissipation
New PCB design with eightfold increase in heat dissipation keeps components cooler and improves long-term reliability.
Fully modular cables
Every cable disconnects from the unit, reducing clutter and improving airflow in cable-constrained cases.
Compact 140mm depth
Fits in smaller form-factor cases without sacrificing power or features.
10-year warranty
Backed by one of the longest warranties in the industry, reflecting confidence in reliability.
- Wattage850 W
- Efficiency80 PLUS Gold / Cybenetics Platinum
- ModularityFully Modular
- ATX StandardATX 3.1
- PCIe StandardPCIe 5.1
- Depth140 mm
- Warranty10 Years
- SKUSEA-743
- EAN4711173878568
- Works with Nvidia RTX 30, RTX 40, RTX 40 Super and AMD RDNA 3 graphics cards via the included 12V-2×6 cable.
- Fits ATX and smaller form factors (Mini-ITX, SFX cases) thanks to 140mm depth.
- Supports full-range AC input (100–240V), making it safe to use worldwide.
- All safety certifications include CB, CE, cTUVus, FCC, and UKCA.
- Output degrades from 100% to 80% when operated continuously above 40 °C; ensure adequate airflow in hot environments.
Best for
- High-end gaming builds with RTX 40 or RTX 40 Super GPUs needing the latest ATX 3.1 connector standard.
- Compact and ITX builds where 140mm depth and full modularity eliminate cable bulk.
- Silent-operation priorities; fanless mode below 30% load keeps noise near zero during idle and light work.
- Users prioritizing long-term reliability and thermal headroom via OptiSink cooling and 100,000-hour MTBF rating.
- Systems built to last; the 10-year warranty is among the longest available and reflects manufacturer confidence.
Trade-offs
- Budget builds under $1000 total system cost; this unit is priced for high-end configurations.
- Older systems using pre-ATX 3.1 components; while backward-compatible, the advanced 12V-2×6 cable is not necessary.
- Systems requiring 1000W or higher; maximum capacity of this unit is 850W.
Following the well-established legacy of the Seasonic FOCUS Series, the FOCUS GX White 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, our new OptiSink technology and a stunning white finish. 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 White ATX 3.1 Series achieves 80 PLUS® Gold certification with its 90 % efficiency at 50 % system load.
New Seasonic OptiSink Design
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.
Hybrid Silent Fan Control – Fanless up to about 30 % load
The industry's first, Seasonic patented, advanced three-phased thermal control achieves optimal balance between silence and cooling. This Hybrid Silent Fan Control functions in three operational stages: Fanless Mode, Silent Mode, and Cooling Mode.
General
| Brand | Seasonic |
|---|---|
| Model | FOCUS GX-850 WHITE ATX 3.1 |
| Colour | White |
Power & Efficiency
| Total Continuous Power | 850 W |
|---|---|
| Efficiency Rating | 80 PLUS Gold / Cybenetics Platinum |
| Efficiency at 50% Load | 90% |
| +12V Output | 70 A / 840 W |
| +5V Output | 20 A / 100 W |
| +3.3V Output | 20 A |
Cooling & Thermal
| Fan Size | 135 mm Fluid Dynamic Bearing (FDB) |
|---|---|
| Fan Control | Hybrid Silent Fan Control (Fanless / Silent / Cooling Mode) |
| Fanless Mode Threshold | Up to approximately 30% load |
| Operating Temperature Range | 0 – 50 °C |
| MTBF (excluding fan) | 100,000 hours @ 25 °C |
Connectivity & Standards
| ATX Standard | ATX 3.1 |
|---|---|
| PCIe Standard | PCIe 5.1 |
| 12V Connector | 12V-2×6 cable included |
| Modularity | Fully Modular |
| Cable Design | Individual White Cables with Braided Pattern |
| AC Input | Full Range (100–240V) |
Physical & Protection
| Dimensions | 150 mm (W) × 86 mm (H) × 140 mm (D) |
|---|---|
| Protections | OCP, OPP, OTP, OVP, UVP, SCP |
| Warranty | 10 Years |
| Safety Certifications | BSMI, C-tick, CB, CCC, CE, cTUVus, EAC, FCC, TUV, UKCA |
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.