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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  • DanNeely - Saturday, April 8, 2017 - link

    If Seasonic wanted to make a status connector to the mobo, they could just terminate it in a plug for a USB2 header like the one company currently making them is.
  • EasyListening - Monday, April 10, 2017 - link

    Does it do RGB?
  • SkipPerk - Wednesday, May 3, 2017 - link

    It does not do RGB because it is VR-ready!
  • blahsaysblah - Sunday, April 9, 2017 - link

    No, PS internals have gotten a lot better. The cabling/connectors have not kept up.

    As i went through the effort of having my latest PC have all custom power cables(not for looks), i researched quite a bit and than having done it(not just read/talk), the connectors and cabling can stand to get modernized quite a bit.

    These connectors were designed for a time when the vision and landscape for PCs was very different. Everyone was going to have their own. Like how each house had multiple TVs. TV numbers have died off as the landscape has changed. So have PCs. The internals and toolings should match the new PC user. Grandma/pa/person who doesnt need it: they use smartphone/tablet/laptop. It's very much a power user.

    status??? how about temperature, so you could have system fans do the heavy lifting? or give the OS a chance to do something about a bad situation?
  • Alexvrb - Tuesday, April 11, 2017 - link

    OK, I get adding "status" output (even though it's a pretty dry and useless data stream to stare at if you have a PSU that's so rock solid it can run for a decade straight without twitching). But how exactly do you propose they "modernize" the cabling and connectors? Not even considering that changing connectors to a new standard for no good reason (other than to piss all over existing standards that work fine) seems silly, there's other issues too. Someone else mentioned it already but it bears repeating: if you reduce the number of wires, but you still need to carry the same amount of current, you MUST move to heavier gauge wires. That means thick, less flexible cabling that people would hate. Does that sound modern? What's the benefit? Are you a better engineer just waiting to show off your superior designs?
  • Asryan - Wednesday, August 19, 2020 - link

    I have the 850w but I'm experiencing gpu coil whine..

    I had read that this kind of coil whine is not dangerous for the devices , whether it is the power supply or the graphics card, could you confirm it to me.

    What is weird is that the noise occurs at + 30FPS +, i've limited FPS to find out it does not occurs only at high fps as i was used to with coil whining GPU... I try to play with the sliders of MSI afterburner and I can hear that the sound changes .

    After that I only hear it if the fans are at their lowest and the panel is open so if it is certain that it cannot harm my configuration, it is not very serious but I would like to be sure.
    However I would like to understand because the problem arises with:

    2 different graphics cards (EVGA FTW3 2080ti and Asus Strix 2080ti Oc that someone gave me for test purposes). The two cards do not make this noise in another config
    2 power supplies of the same model (Seasonic Ultra Prime titanium 850w)
    2 motherboards of the same model. Asus Maximus Hero XI
    Cstate on and off
    Mod cable cables or original cable

    it's driving me crazy mostly because I don't understand WHY but I'm pretty sure it's psu related..
  • bill.rookard - Friday, April 7, 2017 - link

    I have to say, I'm absolutely blown away by the quality of the power coming out of those units. The ripple figures are insane (in a good way!). Considering that I'm looking for a new PSU - this may be 'the one' even at a $160-180 price tag.
  • helvete - Friday, June 16, 2017 - link

    Exactly. shame they don't offer some 400 - 450W variant.
  • Shadowmaster625 - Friday, April 7, 2017 - link

    It is nice to know that if you pay an extra $70 for a power supply, namely a whopping $4-10 a year in electricity savings! Boy, high efficiency sure does pay for itself dont it?
  • Phiro69 - Friday, April 7, 2017 - link

    Written like a true Republican.

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