Review Index:

Seasonic PRIME Titanium Series Power Supplies

Manufacturer: Seasonic

Introduction and Features

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We are going to kick-off the New Year on a high-note by taking another look at Seasonic’s PRIME Titanium series power supplies. When we first tested the new PRIME 750W Titanium PSU last summer, we concluded it was the best overall PC power supply we had reviewed to date. So was that just a fluke? Did we get a hand-picked power supply? Or did our review sample truly represent the outstanding performance that a regular user would experience after buying one of the Seasonic PRIME Titanium series power supplies through normal retail channels? Today, we are going to test two more PRIME Titanium PSUs and compare our findings with the original PRIME 750W Titanium power supply test results. This will provide a unique opportunity to compare three different power supplies from the same series to see how consistent their performance really is, which can be a good indicator of quality.

Sea Sonic Electronics Co., Ltd has been designing and building PC power supplies since 1981 and they are one of the most highly respected manufacturers in the world. Not only do they market power supplies under their own Seasonic name but they are the OEM for numerous big name brands.

Seasonic’s new PRIME lineup was introduced earlier this year with the Titanium Series, which currently includes three models: 850W, 750W, and 650W (with more to follow). Additional PRIME models with both Platinum and Gold efficiency certifications are also making their way into retail channels with models ranging from 850W up to 1200W.

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The two new power supplies we have in for review are the PRIME 650W and 850W Titanium models. These units also come with all modular cables and are certified to comply with the 80 Plus Titanium efficiency criteria; the highest available. The power supplies are designed to deliver extremely tight voltage regulation on the three primary rails (+3.3V, +5V and +12V) and they provide superior AC ripple and noise suppression with an extended hold-up time. Add in a super-quiet 135mm cooling fan with a Fluid Dynamic Bearing and a 10-year warranty, and you have the makings for an outstanding power supply.

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Seasonic PRIME 850W Titanium PSU

Seasonic PRIME Titanium Series PSU Key Features:

•    850W, 750W or 650W continuous DC output
•    Ultra-high efficiency, 80 PLUS Titanium certified
•    Micro-Tolerance Load Regulation (MTLR)
•    Top-quality 135mm Fluid Dynamic Bearing fan
•    Premium Hybrid Fan Control (allows fanless operation at low power)
•    Superior AC ripple and noise suppression (under 20 mV)
•    Extended Hold-up time (above 30 ms)
•    Fully modular cabling design
•    Multi-GPU technologies supported
•    Gold-plated high-current terminals
•    Protections: OPP,OVP,UVP,SCP,OCP and OTP
•    10-Year Manufacturer’s warranty

Please continue reading our review of the Seasonic PRIME Titanium Series PSUs!!!

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Here is what Seasonic has to say about the PRIME power supply line: “The creation of the PRIME Series is a renewed testimony of Sea Sonic’s determination to push the limits of power supply design in every aspect. This elegant-looking, exclusive lineup of new products will include 80 Plus Titanium – in the range of 650W to 850W, and Platinum-Gold-rated units in the range of 850W to 1200W, with excellent electrical characteristics, top-level components and fully modular cabling.

Seasonic employs the most efficient manufacturing methods, uses the best materials and works with most reliable suppliers to produce reliable products. The PRIME Series layout, revolutionary manufacturing solutions and solid design attest to the highest level of ingenuity of Seasonics’s engineers and product developers. Demonstrating confidence in its power supplies, Seasonic stands out in the industry by offering PRIME Series a generous 10-year manufacturer’s warranty period.

The PRIME Titanium Series is Seasonic’s flagship line of power supplies that was developed on the foundations of more than forty years of Seasonic engineering knowledge. Its ultra-high efficiency and outstanding performance are the fine results of Seasonic’s continuous commitment to innovation and advancement. Improved low-load efficiency, highly suppressed ripple noise and a generous 10-year manufacturer’s warranty are just some of the characteristics that set this series apart from other power supplies on the market.”

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January 16, 2017 | 11:51 PM - Posted by toffty (not verified)

I know what my next power supply will be!

Love Seasonic

January 17, 2017 | 12:21 AM - Posted by Anonymous (not verified)

My only regret is that I may never own one of these, because my present PSU (1kw Seasonic KM3 gold) is taking too long to die.

January 17, 2017 | 01:58 AM - Posted by Oubadah

Has Seasonic got their coil whine situation sorted out yet? I think I've had 1 out of 6 Seasonic X and Platinum series units that didn't have an unacceptable level of noise (what the hell is the point of quiet fans and passive operation if the circuitry is squealing like a pig with its nuts in a vice?), so I've been using SuperFlower based PSUs over the last year or so.

The SuperFlower Leadex plugs/sockets are also 100x better than Seasonic's death grip ones which always feel like they're taking excessive force to insert in my experience.

January 17, 2017 | 02:03 PM - Posted by Michael Vuong (not verified)

Not sure, but I've had the same problems. I learned that it's better to buy Corsair with Seasonic as the key, because then you can at least do an advanced exchange. It gets old having to wait for a replacement after three times.

January 17, 2017 | 02:03 PM - Posted by Michael Vuong (not verified)


January 17, 2017 | 05:52 PM - Posted by Lee Garbutt

I have not experienced any high frequency whine from any of the units I have tested - dead silent.

January 17, 2017 | 10:08 AM - Posted by Penteract (not verified)

And no catsup-and-mustard coloring at the end of those beautiful cables! Awesome!

January 17, 2017 | 12:21 PM - Posted by Zachary Davis (not verified)

I picked up one of the 750W models to replace a 5 year old Seasonic X (which was great). Have been extremely satisfied with these PSUs and i recommend them to everyone. Keep up the great reviews guys!

January 18, 2017 | 12:45 AM - Posted by BlackDove (not verified)

I just built a new machine with an X850 Gold. No regrets buying it but the primes look really nice too.

I dont know why they didnt go with a Sanyo Denki fan.

January 19, 2017 | 10:41 PM - Posted by Matman (not verified)

"Weaknesses :
• Close spacing of connectors on front panel can make disconnecting cables a little difficult for people with large fingers"

Seems like clutching at straws :-)

Maybe sometimes it OK to say "This product is actually perfect"

January 24, 2017 | 05:57 AM - Posted by Dark_wizzie

But how does it compare to other PSUs?

January 28, 2017 | 10:05 AM - Posted by BlackDove (not verified)

Theyre among the best ATX PSUs you can get.

March 2, 2017 | 11:02 PM - Posted by GameStone (not verified)

Excellent review as always, I just bought the PRIME 850 W Titanium.

However you may want to update your review as Seasonic have now raise their industry leading warranty to 12 years (from 10 years).

I found out about it on Toms Hardware.,33791.html

Keep up the great work.

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