Seasonic FOCUS PLUS Gold 550W Power Supply Review

Small computer power supplies that are entirely modular are the cornerstone of Seasonic's Focus Plus series. We are reviewing the Gold variant today rated at 550 watts that has a modern design and with hybrid silent fan control with a fluid dynamic bearing fan. Is the smallest PSU in the Focus Plus series making the cut?


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 Gold line up the FOCUS PLUS Gold 550W (SSR-550FX).

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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Can Gold Equal Platinum?

While today we are looking at our 8th example from Seasonic's FOCUS PLUS line of power supplies, we are looking at perhaps the lowest end model of the FOCUS PLUS units; the FOCUS PLUS Gold 550W. Not only is this unit the lowest capacity found in the FOCUS PLUS line currently but it is also the lowest slotted based on the tiering of efficiency that Seasonic has used. Previously, the Platinum model at this capacity turned out to be a great unit but not the greatest deal. Today, we would expect that the FOCUS PLUS Gold 550W to follow in those footsteps but perhaps, given its lower tiering, correct that one deficiency we found in its Platinum sibling. Before moving on to see though, let's look at what Seasonic has to say about the unit:

FOCUS Plus 550 Gold

If you are looking for your next compact system build ideas, the FOCUS+Gold 550 watt power supplies may be the ideal choice for you with their reliable and efficient power delivery, fully modular cables and efficiently regulated quiet operation. The high quality 120mm Fluid Dynamic Bearing (FDB) fans are very quiet and proven to be very stable over the long run. When you couple these great FDB fans with Seasonic’s own Hybrid Silent Fan Control, then you have a power supply that outputs the least possible sound levels during operation.

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