Seasonic FOCUS PLUS Platinum 850W PSU Review

850 watt computer power supplies from Seasonic are nothing new to us, but Seasonic is taking a bit of a different direction with this Focus line of PSUs. The Focus Plus Platinum has been designed with a small footprint in mind, specifically built for those looking to build high powered small form factor computers like HTPCs.


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 Platinum lineup. In this review, we will specifically be looking at the 850W model (SSR-850PX) variously listed as the Focus+ Platinum 850W, Focus+ Platinum 850, Focus Plus 850 Platinum, FOCUS Plus 850 Platinum, FOCUS PLUS Platinum 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.

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Refocusing on 850W

Today's FOCUS PLUS Platinum 850W is not only the latest in a long line of power supplies that we have seen from Seasonic, or even the latest in a long line of FOCUS PLUS units that we have seen, but also the second 850W model we have seen from this line. The first 850W model we saw from Seasonic was the FOCUS PLUS Gold 850W and that unit was an excellent product. So, today, we would expect this unit will be an excellent product as well. What will be interesting to see is if this unit can not only match that previous unit, but also build a case for why this unit is better than that unit. That is certainly a more difficult task than just being a good unit. That said, there is always the chance that something goes wrong with a product so we aren't going to get to far ahead of ourselves yet and we are still going to put the screws to this unit. Before moving on to see if it can not only survive and match the previous FOCUS PLUS Gold 850W but find a way to surpass it, let's look at what Seasonic has to say about the unit:

Thanks to its small form factor the Focus+ Platinum 850 watt power supply is a mighty solution for those, who want to implement a smaller HTPC system or living room computer. This high quality unit is built with top-rated highly reliable aluminum electrolytic solid capacitors and it features Seasonic’s new cable-free connection design where the back panel and the PCB (Printed Circuit Board) are connected by a copper plate. This premium design feature is a breakthrough solution that lowers the chance of production errors and improves output power quality.

Let’s move on now and see what we can expect when a user purchases the FOCUS PLUS Platinum 850W power supply in retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.