Seasonic FOCUS PLUS Platinum 550W PSU Review

Seasonic has turned into the go-to PSU supplier for those enthusiasts looking for the best when it comes to supplying long lasting quality power for their gaming rigs and workstations. We dip down a bit in terms of supplied power, this PSU being a "small" 550 watt unit. Will its high efficiency put us in the cool and quiet category as well?


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 another product from Seasonic's FOCUS PLUS Platinum line up the FOCUS PLUS Platinum 550W (SSR-550PX).

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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Shifting Our FOCUS A Little Lower In Capacity

Today, we are looking at our 4th example from Seasonic's FOCUS PLUS line of power supplies. However, with today's review we are looking at the lowest capacity unit, so far, as we are looking at a 550W model. Previously, the larger capacity units we have seen in this line (750W and 850W) have turned out to be great units and great deals. Obviously, given that this line is supposed to be a more mainstream product line, that pair of characteristics is key to having a product line that is hard to beat. Now, given that history, we would expect that the FOCUS PLUS Platium 550W is going to follow in those footsteps at this lower power output level. However, at some point, when you share a platform across large capacity ranges there is one end that is going to be outside of that optimal range for price and performance. With the top end having looked so good, we have to cast a very critical look at this low end to see if it can do just as well. Before moving on to see though, let's look at what Seasonic has to say about the unit:

FOCUS Plus 550 Platinum

The fully modular, 80PLUS Platinum rated FOCUS+ Platinum 550 watt unit is based on the DC to DC Converter Design and its electric performance characteristics are impressive with their tight voltage regulation. These power supplies use high temperature Japanese capacitors to ensure stability under extreme conditions. Besides its stability and remarkable output characteristics, this unit has the highest power density in its class. Silence enthusiasts will appreciate the Seasonic Hybrid Silent Fan Control system that is the industry’s first three-phased advanced thermal control to achieve optimal balance between silence and cooling.

Let's move on now and see what we can expect when a user purchases the FOCUS PLUS Platinum 550W power supplies in retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.