Seasonic X-Series: X-650 Power Supply Review

Seasonic's X-Series computer power supply comes to us boasting a patented fully modular design that minimizes voltage drops and impedance while greatly maximizing efficiency, cooling, and overall performance. Being a Seasonic unit, we can also count on it targeting the users looking for a quiet computing experience.


In the power supply realm, when consumers think of quiet and efficient power supplies one of the first company that comes to mind is Seasonic. Today, we have our 14th look at a Seasonic branded unit. This review covers another entry in Seasonic’s excellent X-Series line of power supplies; the X-650 (SS-650KM3 Active PFC F3).

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 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 their reputation for quality, has lead to a real explosion in production as Seasonic can be found providing OEM services on various model lines for Antec, Corsair, PC Power and Cooling, and of course under its own Seasonic brand.

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How Many X-Series Power Supplies Does it Take to Screw in a Light bulb?

The Seasonic X-650 is the 8th power supply we have seen from Seasonic’s X-Series of units. To date, all of those members of the X-Series have been winners and the X-Series line has been around long enough that Seasonic is starting to roll revisions to some of the earlier models. Today’s X-650 (SS-650KM3 Active PFC F3) is a revision to the original X-650 (SS-650KM3 Active PFC) much like what we saw recently from the X-850. Also as with the X-850, the X-650 was not among the original X-Series units we reviewed so the X-650 is a "new" unit to us. Given the other X-Series unit we have reviewed though, we certainly have high expectations for this unit today. Indeed, among Seasonic’s offerings the X-Series slots in right under their Platinum series as one of their high end offerings and has been a consistent performer. So, with that in mind, we have to see what Seasonic has to say about this unit:

Seasonic Patented DC Connector Panel with Integrated Voltage Regulation Module

Seasonic’s Patented Fully Modular Design while minimizing voltage drops and impedance, it greatly maximizes efficiency and cooling to enhance overall performance and reliability.

* Patent #: US8.040.686, TW381825, CN1552150, JP3171420.

Patent Pending: US, DE

Seasonic Hybrid Silent Fan Control آ– S2FC and S3FC

The industry first, advanced three-phased thermal control balances between silence and cooling.

The Hybrid Silent Fan Control provides three operational stages: Fanless, Silent, and Cooling Mode. In addition, there is a switch provided to allow for manual selection between the Seasonic S2FC (fan control without Fanless Mode) and the S3FC (fan control including Fanless Mode).*Patent #: TW410250, CN808637, CN1980304. Patent Pending: US, JP

Sanyo-Denki San Ace Silent Fan

The world-renowned Sanyo Denki Ball bearing fans are made of the highest quality components to ensure maximum quality and performance. The use of spoon shaped high-density plastic fan blades with smoothed leading edges, strict tolerance ball bearings and precision copper axel are just some features to ensure ultra-low noise performance and quality. In addition, the fan uses 3 balancing points, instead of the industry standard of 2 points, to ensure perfect balance and rotation. The Sanyo Denki fan is a perfect match to the class leading Sea Sonic Hybrid Silent Fan control for the absolute top performance of the industry.

With little of substance there other than some advertising points about specific features (that we have seen before), let’s move on and see what we have to look forward to when we purchase the Seasonic X-650 power supply in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.