Seasonic

Seasonic Focus GX-850

Expert rating8.2 / 10

Wattage:: 850 W
80 PLUS Rating:: Gold
Modularity:: Fully Modular
ATX Standard:: ATX 3.1

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Manufacturer: Seasonic Last updated: 2026-09-12

Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) Review

If you're searching for the Seasonic Focus GX-850, or just looking for a solid 850W 80 PLUS Gold PSU in a ATX form factor, here's the full rundown on specs, price, and how it stacks up.

Short answer: the Focus GX-850 is a fully modular 850W unit built to the ATX 3.0 spec, and we'd recommend it if you want Gold-tier efficiency at this wattage without chasing a flagship price tag.

Efficiency and Build Quality

The Focus GX-850 carries an 80 PLUS Gold certification and Cybenetics Gold efficiency / A noise, built on a Seasonic platform. Its 120mm FDB, Fluid Dynamic Bearing keeps noise down, with Zero-RPM fan-stop under light loads.

Connectors and Cabling

You get 1x 24-pin ATX, 1x EPS 4+4, 1x 12V-2x6 (450W), 4x PCIe 6+2-pin, 6x SATA, 3x Molex. Cable lengths run 24-pin 610mm, EPS 650mm, 12V-2x6 610mm, PCIe 650mm, SATA 750mm, and the cables are standard black ribbon/flat, not sleeved. It's rated for a 17ms hold-up time and backed by OCP, OVP, OPP, SCP, OTP, UVP protection circuitry.

Comparison to Alternatives

Compared to the Seasonic Focus GX-750, the Focus GX-850 lands in the same efficiency tier at a different capacity, so the choice mostly comes down to how much wattage headroom you actually need. It's also worth cross-shopping against the Corsair RM850x if you're weighing Gold-tier options in this wattage class; both land in a similar price bracket, so the deciding factor usually comes down to form factor, cable sleeving, and warranty length.

Specifications

Identity

Brand	Seasonic
Model Number	Focus GX-850

Output and rails

+12V Rail Amperage	70 A
Single +12V Rail	Yes

Standards and compliance

PCIe CEM Standard	PCIe 5.1
Hold-Up Time	17 ms

Connector inventory

EPS 8-pin Connectors	2
SATA Connectors	8
Molex Connectors	3

Form factor and fit

Length	140 mm
Colour	Black

Build quality

MTBF	100000 hours

Cables

Modularity	Fully Modular

Monitoring, protection and price

Protections	OCP, OVP, OPP, SCP, OTP, UVP
Price	139.99 USD
Warranty	10 years

Wattage	850 W
80 PLUS Rating	Gold
ATX Standard	ATX 3.1
Form Factor	ATX
Cybenetics Efficiency	Platinum
Cybenetics Noise	A-
12V-2x6 Connectors	1
Zero-RPM Mode	Yes
Sleeved Cables	No
PCIe 8-pin Connectors	2
Connector Count	1x 24-pin ATX, 2x EPS 4+4, 1x 12V-2x6, 2x PCIe 6+2-pin, 8x SATA, 3x Molex
Fan Size	135 mm
Fan Model / Bearing	Fluid Dynamic
OEM / Platform	Seasonic
Japanese Capacitors	Yes
Cable Lengths	24-pin 610mm, EPS 650mm, 12V-2x6 610mm, PCIe 650mm, SATA 750mm
Source URL	https://seasonic.com/focus-gx-atx-3/

Expert Review

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8.2 / 10

Seasonic's own in-house build quality at a mainstream 850W price point, with the updated ATX 3.0 spec and a native 12V-2x6 cable that the older Focus GX-750 doesn't offer.

Best for

High-end single-GPU gaming builds (RTX 4080/4090-class cards)
Builders who want Gold-tier efficiency with future GPU upgrade headroom
Systems that benefit from a native 12V-2x6 cable

Not for

Budget builds where a 550-650W unit would be sufficient
Extreme dual-GPU or workstation rigs needing 1200W+
Buyers who specifically need SFX/SFX-L sizing

FAQs

What are the key specifications of the Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0)?

The Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) is a power supply from Seasonic. Key specs: Wattage 850 W, 80 PLUS Rating Gold, Cybenetics Efficiency Gold, Cybenetics Noise A, Modularity Fully Modular.

Will the Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) work with my current setup?

The Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) lists Wattage is 850 W. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0) best suited to?

It suits high-end single-gpu gaming builds (rtx 4080/4090-class cards), builders who want gold-tier efficiency with future gpu upgrade headroom, systems that benefit from a native 12v-2x6 cable.

What are the drawbacks of the Seasonic Focus GX-850 (850W/80+ Gold/ATX/Fully Modular/ATX 3.0)?

It is a poor fit for budget builds where a 550-650w unit would be sufficient, extreme dual-gpu or workstation rigs needing 1200w+, buyers who specifically need sfx/sfx-l sizing.