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 - Monday, April 10, 2017 - link

    I have a crucial mx 300 2TB for my storage and im waiting for 256GB optane SSD's to switch that over the boot drive and most used apps. I am not bothering with the caching version.
  • Laststop311 - Monday, April 10, 2017 - link

    o and i got it the 2tb ssd or 476 out the door here on sale
  • Laststop311 - Monday, April 10, 2017 - link

    no optical drive all drive cages removed for max airflow as well. I am the most proud of the build if u cant tell it's in my bedroom and i cant even hear it when i sleep. I'm so ecstatic.
  • Laststop311 - Monday, April 10, 2017 - link

    email me is u need help building this exact PC i promise there isnt a single person that wont be thrilled to have it jtarmeni1 (AT) (g)(mail(dot)com
  • Laststop311 - Monday, April 10, 2017 - link

    and dont bother with any ram above 3400mhz cas 14 3400mhz provides the best performance of all ram trust me i tried.
  • Laststop311 - Monday, April 10, 2017 - link

    the higher timings negates the performance and u spend more money, until they release 3600 cas 14 3400 cas 14 is the fastest
  • jo-82 - Monday, April 10, 2017 - link

    Am i the only one who finds 40 dB(A) @ 50% load (300W) out of the question?
  • Exodite - Tuesday, April 11, 2017 - link

    No, though I've come to the realization that you have to treat dB measurements as an internal metric for each article/site and not an universal truth.

    Variations due to measuring methodology, equipment and ambient sound level means dB measurements don't compare well across different reviewers/sites.

    Personally I prefer always-on equipment such as case and CPU fans to idle <20 dB and load noise, including GPUs, <30-35 dB so I reckon I'm in a similar position. Some reviewers, a surprising number even, have ambient sound levels higher than I'd tolerate even a fully loaded computer to make.

    More than that dB measurements fail to pick up sound characteristics. A great fan/cooler can be tolerable at higher dB levels because the only real sound tends to be from moving air, a soft "whoosh" if you will. The bad ones add ticking or grinding, for example I find the default Radeon fans to be completely intolerable at any load level. And even fanless equipment may be saddled with electrical noise that cut right through the case and ambient sound.

    In the end you really have to listen yourself to make a judgment and if that's not an option rely on a comparison to a unit you've heard yourself that's been tested by the same reviewer/under the same conditions.
  • Laststop311 - Tuesday, April 11, 2017 - link

    u wont be disappointed with a 750 watt seasonic prime. The fans dont even turn on until u hit 375 watts of power draw. Which basically means even maxing out ur cpu isnt enough to turn them on. You have to play a game and most games utilize like on averahe 80% of ur cpu and yea the fan on the psu is dead silent when it does spin. Concentrate and getting a quiet GPU. Get a triple slot with GPU with a HUGE heatsink and adjust the fan profile till right before you hear it. The highe heatsink makes yup for the large speed. I really like the triple slot gpu's with 3x 100mm FDB fans plus nh d15s noctual cooler using liquid metal paste and the awesome titanium rated seasonic psu. With 11 blade fractacl venturi high flow fans with thge drave cages inside removed. this way you need no static pressure so even on low speeds the air pushes deep into the case and since its 2x 140mm inttake 1 140mm GP14 fractacl exhaust yu get positive pressure meaning you only have to clean the case once every 2-3 years as only microscopic particloes get in. You can run the fasn all at the lowest speed before you hear it even with good overclocks. I sleep right next to the bed thats how quiet it. Seriously I will facetime you thru the build for 45 buvks an hour. And teach you all the tricks to deaden every vibration while keeping all ur components in the 70C's or less
  • Laststop311 - Tuesday, April 11, 2017 - link

    its the best build in the world if u want silence and still a lot of power, yes no9t the max power but if you all u care about is gaming at 1080 with 144hz which imo is better then 2560x1440 and 60hz by a far as well a 4k at 30-60hz by far

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