Seasonic FOCUS PLUS Gold 850W Power Supply Review

Author:Paul Johnson

Editor:Kyle Bennett

Date: Tuesday , July 11, 2017

Seasonic's new high efficiency enthusiast computer power supply claims to be silent through 425 watts of power delivery. An improved fluid dynamic bearing fan helps with this. The Focus sports a cable-free connection panel, and has an industry leading 10 year warranty. And this unit was sourced out of retail stock, just like you would buy.


In the power supply realm, when consumers think of quiet and efficient power supplies one of the first companies that comes to mind is Seasonic. Today, we are having a look at a brand new Seasonic unit that is part of their new FOCUS PLUS Gold lineup. In this review, we will specifically be looking at the 850W model (SSR-850FX) variously listed as the Focus+ Gold 850W, Focus+ Gold 850, Focus Plus 850 Gold, FOCUS Plus 850 Gold, FOCUS PLUS Gold 850W, etc.

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. During that more than 40 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 lead 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 own Seasonic brand.

Bringing The Mid-Range Into FOCUS?

While today's FOCUS PLUS Gold 850W is the latest in a long line of power supplies that we have seen from Seasonic, it is the first unit we have seen from Seasonic's new mid-range FOCUS PLUS line of products. In the past, we have seen a number of mid-range products from Seasonic (like the G-Series units) and these products have been excellent even though they were not "top of the line". So, with today's FOCUS PLUS Gold 850W fitting into the same general mold we would certainly hope to see it living up to the kind of performance that we have seen from those previous mid-range Seasonic products. Before moving on to see though, let's look at what Seasonic has to say about the unit:

This high-wattage unit boasts ultra-high 80 PLUS Gold efficiency which achieves 90 % efficiency at 50 % system load. Due to its small size the FOCUS PLUS Gold power supply is a great solution for smaller computer cases in the living room for instance. This power supply is not only small, but mean too. It boasts the highest power density in its class and it also has remarkable output characteristics during operation. The technologies applied and the components and materials used in the manufacturing of the FOCUS PLUS Gold 850 are in line with Seasonic’s highest standards.

While that is all very much as would expect to hear about the FOCUS PLUS Gold 850W something we did not expect to hear from Seasonic came a few days before product was meant to ship to reviewers. As we documented in the News Post Seasonic Pulls the Plug on Review Samples - Retail Direct for Reviews, Seasonic has recently changed the way they are handling review samples with reviewers in North America. Rather than shipping units from Seasonic HQ or from Taiwan/China, they are purchasing the review units and having them directly shipped from retail/etail to reviewers. This is a rather large change but it is not the only time this has happened. In fact, over the years, we have acquired review samples in a number of ways. The most common ways are as units we purchase with our own funds (as units solely for review or to double check that review samples are in fact legitimate samples) and units that are shipped directly from the brand. On a few occasions, however, we have also gotten units that have been shipped from retailers by the brand themselves (as Seasonic is now doing). Obviously, this last method is far more trusting and open than any of the other methods and it is something that we would love to see propagate (and have asked about before).

So, today, we say thank you in general to the brands that have played by the rules over the years with handling review samples without interference and thank you again to Seasonic for trying to change the model altogether to a better one. Now, let's move on and see what we can expect when a user purchases the FOCUS PLUS Gold 850W power supply in retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.