.png)
The Seasonic FOCUS GX-850 ATX 3 (2024) is an 850W, fully modular ATX 3.1 power supply with a hybrid fan mode. As part of the upgraded FOCUS GX series, it now complies with ATX 3.1 and PCIe 5.1 standards.
As of this publication date, Seasonic released this power supply in mid-November 2024 at an MSRP of $159.99 USD for the White colorway, while the Black colorway is priced at an MSRP of $149.99 USD.
This version features Seasonic's new 'OptiSink' internal design. The naming scheme may be slightly confusing, as this power supply is part of the FOCUS V4 series and may also be listed with "2024" appended to the product name. The FOCUS GX-850 ATX 3 (2024) is recommended for its resilience to power excursions and good load regulation.
WHAT YOU NEED TO KNOW
THE GOOD
- Colorways
This power supply is available in both white and black, making it one of the few white Seasonic power supplies on the market.
- Load Regulation
The power supply performed well in terms of load regulations across all rails except the 5Vsb. However, the 5Vsb still remained within specifications, and critical components will not be reliant on it.
- Excursions
It passed all of the excursion tests, failing only some of the fastest durations, but pass all of the excursions at the highest temperatures.
THE BAD
- Nothing at the time of writing
THE REST
- Overall
The FOCUS GX-850 ATX 3 (2024) performed as expected for its class and price range. It is recommended for its resilience to excursions and solid load regulation.
*This website uses affiliate links. Purchases made through these links may provide compensation to Linus Media Group.
The Seasonic FOCUS GX-850 ATX 3 (2024) is an ATX form factor power supply that comes with a range of accessories, including a PSU and cable bag, a PSU tester, and velcro cable ties. The cables are flexible with an etched braided pattern. The version Labs tested was white, with all components (except the power cable) matching the color scheme. This power supply is available in both white and black.
The newly released version is designed with Seasonic's 'OptiSink' internal design, which reorganized internal components to improve heat dissipation and airflow. A 135 mm fluid dynamic bearing fan ensures efficient cooling.
The power ratings and specifications align with expectations for this price range. On the Seasonic specifications webpage it specifies that the Operating Temperature is 0°C to 50°C, though we cannot verify this through testing.
1 of 4
Front of the box.
1 of 2
Power input side of the PSU.
Top of the PSU displaying the fan.
Bottom of the PSU displaying the specifications.
| +12 V | +5 V | +3.3 V | +5 Vsb | -12 V | |
|---|---|---|---|---|---|
| CURRENT | 70 A | 20 A | 20 A | 3 A | 0.3 A |
| WATTAGE | 840 W | 100 W | 15 W | 3.6 W | |
| 850 W | |||||
Please note that the above ratings are manufacturer advertised specifications.
The FOCUS GX-850 ATX 3 (2024) includes a single hybrid fan mode, controlled by Seasonic's "Digital Hybrid Fan Control". It operates in three stages: Fanless Mode, Silent Mode, and Cooling Mode.
The power supply also includes standard protections and is backed by a 10-year warranty, typical for power supplies in this class.
In terms of performance, the FOCUS GX-850 ATX 3 (2024) showed good results, with solid load regulation across all rails except for the 5Vsb rail, which approached the minimum specification under high loads. However, this should not pose any issues as critical components do not rely on the 5Vsb rail. The 12V rail maintained a stable voltage with a drop of only 0.143V across its full output power range of 850W, meeting ATX specifications.
The power supply also met ATX ripple specifications, with an average peak-to-peak signal ripple of 41 mV on the 12V rail, and 30 mV and 39 mV on the 5V and 3.3V rails, respectively. It handled most excursion tests well, failing only some of the fastest durations but passing all excursions at the highest temperatures.
1 of 6
The FOCUS GX-850 ATX 3 (2024) is 80PLUS Gold certified, delivering 91% efficiency at 50% of its maximum rated load. It met all 80PLUS efficiency points across its entire power range. In brownout tests, it sustained dropouts for up to 13 ms at 115V and 12 ms at 230V, which is average but may make the unit less resilient to extended brownouts.
The power supply's protections were triggered at around 135-140% load, with the 5Vsb and -12V rails exceeding that range. The Over Power Protection engaged at 141% of the rated load, and the 12V rail alone handled up to 97A, or 139% of its rating, ensuring safety in case of minor overdraw.
