Founded over 35 years ago, Seasonic is one of the first PC power supply manufacturers and today their products are held in very high regard amongst PC enthusiasts. Despite their high popularity and recognition that the brand name has, the company is one of the very few that did not diversify towards other segments of the market. Seasonic is solely focused on the design, manufacturing and marketing of quality PC power supply units.

During the past several years, we reviewed several of Seasonic’s PSUs, including their latest 80Plus Gold and 80Plus Platinum series. Today we are having a look at their latest product series, the 80Plus Titanium certified PRIME. Seasonic designed the PRIME PSUs to offer the best possible performance and quality they could while keeping the price tag within reasonable limits. The series consists of five units, one fanless 600W model and four regular units with their maximum rated power output ranging from 650W to 1000W. In this review we are going to test three out of the five units of the series, the 650W, 750W and 850W versions. (It is worth noting that the 600W and 1000W versions not yet available to the North American markets, which is sometimes a limitation in our sampling.)

Model Price
Seasonic PRIME SSR-650TD $170 incl. shipping
Seasonic PRIME SSR-750TD $175 incl. shipping
Seasonic PRIME SSR-850TD $200 incl. shipping

Seasonic PRIME Titanium
Power specifications ( Rated @ 50 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
650TD 750TD 850TD
MAX OUTPUT 20A 20A 54A 62A 70A 3A 0.3A
100W 648W 744W 840W 15W 3.6W
SSR-750TD: 750W
SSR-850TD: 850W


Packaging and Bundle

Seasonic kept their packaging very simple, elegant and functional. The artwork is limited to basic geometric shapes and metallic colors. Our early samples came with an error on the packaging as well - the PRIME units are covered by a 12-year warranty, not 10 years as indicated on our packaging. The packaging is very sturdy, with thick cardboard walls and polyethylene foam pieces protecting the product inside.

Inside the packaging, we found the necessary AC power cable, four typical 3M mounting screws, a good user’s manual, a few typical cable ties, five high-quality cable straps with the company logo, a metallic case badge, and a sticker. There were no thumbscrews or black screws included.

The PRIME PSUs are fully modular. Every cable, including the 24-pin ATX cable, is detachable from the chassis. With the exception of the 24-pin ATX cable that is enfolded in black nylon sleeving, the rest of the cables are “flat”, ribbon-like. All of the cables have black connectors and wires.

Connector Seasonic SSR-650TD Seasonic SSR-750TD Seasonic SSR-850TD
ATX 24 Pin 1 1 1
EPS 4+4 Pin 2 2 2
EPS 8 Pin - - -
PCI-E 6+2 Pin 4 4 6
PCI-E 8 Pin - - -
SATA 6 10 10
Molex 5 5 5
Floppy 1 1 1
External and Internal Design
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  • Laststop311 - Tuesday, April 11, 2017 - link

    I can also show you how to easily overclock to 165hz for even smoother 1080 gaming.
  • Laststop311 - Wednesday, April 12, 2017 - link

    I will give you one of my secrets spraying the sound deadening dynamat on every piece of bare metal you can see. and not using any spinning hard disks in the build to show you I am for real. We can face time or skype and I will guide you to killing every vibration in ur machine a baby could sleepp next to it. I've already had 1 taker it only took 1 hour so im raising the fee to 70 an hour as he got a bargain for 45 dollars of bitcoins. You want a quiet machine im ur man this is my passion.
  • Laststop311 - Wednesday, April 12, 2017 - link

    I wil also give you my full name Joseph Armeni this s no scam if you want a dead silent PC contact me. My first customer was thrilled.
  • Laststop311 - Wednesday, April 12, 2017 - link

    jtarmeni1 (at) (G)(mail)(dot)com
  • Sivar - Wednesday, April 12, 2017 - link

    From the conclusion page: "...they are not using any of the latest “leading” topologies or technologies"
    What topologies and technologies? Who is using them?
    Perhaps there's hope for an 80+ standard that goes beyond even Titanium?
  • jagdpanther - Saturday, June 9, 2018 - link

    Other than price and a little efficiency, what is the difference between a Seasonic Prime Ultra 850 Titanium and a Seasonic Prime Ultra 850 Gold?

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