Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply Review

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Seasonic VERTEX GX-850 ATX 3.0

Seasonic is one of the older companies producing consumer power supplies having been founded in 1975 and entering the PC power supply production market in 1980. Seasonic is the OEM and ODM of this unit. During more than 30 years as a company, Seasonic has cultivated lines of power supplies that are today some of the standard-bearers for efficiency and quiet computing. This focus, and its reputation for quality, has led to an explosion in production as Seasonic can be found providing OEM services on various model lines for Antec, XFX, Corsair, PC Power and Cooling, and of course under its Seasonic brand among many more.

Today, we will be looking at one of Seasonic’s own branded units the Seasonic VERTEX GX-850 ATX 3.0 850W Power Supply (12851GXAFS). This power supply packs enough power for most users, 850W, into the brand new ATX 3.0 standard, with PCIe 5.0 12VHPWR, excellent efficiency, and an impressive warranty period.

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The Seasonic VERTEX GX-850 ATX 3.0 is the third power supply we have seen from Seasonic here at TheFPSReview. Certainly, though, we are familiar with Seasonic as we have seen a lot of their power supplies over the years in other avenues. However, this particular unit is interesting in that it is coming in at a very mainstream 850W and supports the new, latest, and greatest revisions to the ATX12v specification. Thus, if this unit ends up being that mainstream, but modern, killer it is looking like then it might make it one of the most compelling power supply in the mainstream market today. Let’s first see what Seasonic has to say about this unit:

  • ATX 12V
  • ATX 3.0 and PCIe 5.0
  • Fully Modular
  • 80 PLUS Gold Certified
  • Cybenetics ETA Platinum and Lambda A Certified
  • 12 Years Warranty****

The new VERTEX Series units will provide 1200 W / 1000 W / 850 W and 750 Watts of true power in both Platinum and Gold levels of efficiency, with all the best features you can expect from a Seasonic power supply.

Let’s move on now and see what we can expect when a user purchases the Seasonic VERTEX GX-850 ATX 3.0 power supply in retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.

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REVIEW OVERVIEW

Voltage Regulation
9.5
DC Output Quality
9.25
Efficiency
9.75
Noise
9.25

SUMMARY

We reviewed the Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply, which performed very well in our testing, producing great Voltage Regulation, DC Output Quality and Efficiency in our testing. This is a solid PSU that will work great in your system, and met our validation testing. If you need a solid PSU, at a great price, loaded with the latest features for today's PCs, check out the Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply.
Paul Johnson
Paul is a long time PC hobbyist and tech enthusiast having gotten his start when he broke his first C64 quickly followed by breaking his first IBM XT. Most notably however, for 12 years, he served as the Power Supply Editor for one of the truly early, groundbreaking, and INDPENDENT PC enthusiast sites ([H]ardOCP) until its mothballing in April of 2019. Paul now brings the same flair and style of his power supply reviews to The FPS Review.

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We reviewed the Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply, which performed very well in our testing, producing great Voltage Regulation, DC Output Quality and Efficiency in our testing. This is a solid PSU that will work great in your system, and met our validation testing. If you need a solid PSU, at a great price, loaded with the latest features for today's PCs, check out the Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply.Seasonic VERTEX GX-850 850W ATX 3.0 Power Supply Review