Seasonic PRIME 850W Platinum Power Supply Review

As is usual, Seasonic talks softly and carries a big stick. The biggest stick lately has been its Prime series power supplies. Today's Prime comes to us touting excellent efficiency, a fully modular design, tight output voltage, and a quiet noise profile supplied by a fluid dynamic bearing fan. Does Seasonic continue its current reign?


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 our look at a brand new Seasonic unit that is part of their new PRIME Platinum series. In this review, we will specifically be looking at the 850W model in the PRIME Platinum series (SSR-850PD 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 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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PRIME TIME Platinum?

Today's PRIME 850W Platinum is the latest in a long line of power supplies that we have seen from Seasonic and it is following the outstanding PRIME 850W and PRIME 750W models we reviewed not to long ago. Obviously, there are some differences today with the PRIME 850W Platinum over those previous flagship units. However, given how those reviews went, and the fact that we are moving down just one "tier" among Seasonic's now much expanded PRIME lineup, we have high hopes for this unit. That said, the PRIME 850W and the PRIME 750W were possibly the best units we have ever seen so the PRIME 850W Platinum has either a good pedigree or a tall order to fill. Or both. So, before we move ahead, let's see what Seasonic has to say about this unit:

The Seasonic PRIME Platinum 850 watt power supply is a champion is stable and reliable power delivery. It boasts a near-perfect voltage output which represents Seasonic’s market leading engineering feat. This unit is ideal for users who want to reduces noise levels in their work environment, as it has an oversized, 135 mm Fluid Dynamic Bearing Fan that is controlled by Seasonic’s proprietary Premium Hybrid Fan Control. An innovative Cable-free Connection Design solution employs highly conductive copper plate to replace the traditionally used cables for a cleaner design an to increase power efficiency.

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