SeaSonic Platinum-760 Power Supply Review

SeaSonic renamed its renowned X series to the Platinum family. These are the company's high-end power supplies, all of them sporting Platinum-rated efficiency and output up to 1200W. Some of the lower-wattage models are even fan-less.

The Platinum-760 is a mid-range member of the series, unsurprisingly sustaining up to 760W. Typical of SeaSonic, the PSU sports hybrid fan control, which can be turned on or off by means of a switch. In Normal mode, the fan runs continuously, whereas it runs only when needed in Hybrid mode.

This 760W power supply's workmanship is impeccable, similar to the other Platinum-class contenders we've already looked at. In the same vein, neither the fully modular cabling approach nor the single-rail design surprise us. Expect the +12V rail to deliver up to 63A.

Most of SeaSonic's cables are flat; only the motherboard cable is sleeved and round. The number of connectors you get is comparable to FSP's offering, though the Platinum-760 sports an additional CPU and SATA connector. But they're all slightly shorter than what FSP provides.



Like most of SeaSonic's high-end PSUs, the SS-760XP2 has a seven-year warranty.

SeaSonic Platinum-760 (SS-760XP)
AC Input100-240V, 50-60Hz
DC Output+3.3V+5V+12V (#1)+12V (#2)+12V (#3)+12V (#4)-12V+5Vsb
25A25A63AN/AN/AN/A0.5A3.0A
Individual Output  32 A  6W15W
Rail UtilizationSysSysCPU & VGA
Combined Output125W756W
Total Continuous Output760W
Peak OutputN/A

Efficiency According To The 80 PLUS Spec

Efficiency In Typical Use Cases

Once again, the 80 PLUS Platinum specification poses a formidable challenge. Like Corsair's previously-reviewed submission, the SeaSonic Platinum-760 struggles to meet its efficiency requirement at a 50% load. However, a 91.73% measurement is close enough to 92%. As with Corsair and FSP, we're not going to make a big deal out of this.

At 100% and 20% load, the SS-760XP2 easily satisfies Platinum's requirements. But at very low loads, it is less efficient than FSP's Aurum 92+. SeaSonic's higher output rating may be partly to blame.

SeaSonic PSUs are renowned for excellent ripple and noise numbers, and the SS-760XP2 is no exception. Low ripple voltages on all power rails and a nice-looking scope picture are an indication of excellent electrical quality.

The Platinum-760 passes all other tests with aplomb. At 110V, its stand-by power is the lowest of all three PSUs, and its hold-up time is the longest (at least at 230V).

When we measured the sound level, we recorded results we liked and others we didn’t. In hybrid mode, the fan doesn’t even turn on during our 50 and 200W tests. However, when it does turn on (at 600W in our case), it was louder than expected. Mostly, its sound level is 34.1 dB(A), which is still barely acceptable. But sometimes the fan speed revs up briefly, which results in a sound level of 40 dB(A). That's less than acceptable. Thus, if you draw more than 600W from this PSU, we recommend turning the hybrid mode off to prevent its fan from revving up.

A Closer Look at the PCB

Compared to FSP's Aurum 92+, the SeaSonic PCB is densely populated. The Platinum-760 sports a modern design, including a full-bridge topology, LLC converter and DC-DC technology. SeaSonic sources all of its parts from top-quality manufacturers. The primary capacitor is made by Hitachi, while the secondary-side capacitors are manufactured by Rubycon and Nippon Chemi-Con. Unsurprisingly, the soldering quality is excellent.

Conclusion

SeaSonic’s top-end models come with a seven-year warranty, excellent workmanship and superb electrical quality. The Platinum-760, the highest-output PSU in our three-way comparison, is no exception. From a feature set perspective, this PSU lands in the middle between FSP's and Corsair's products, albeit quite a bit behind the HX750i. That doesn't mean the Platinum-760 is lacking, though.

As for efficiency, SeaSonic almost reaches Corsair’s levels. And its ripple and noise values are excellent, beating the other two PSUs. Electrical quality and PCB design are excellent. With all that in mind, why is this model not the clear winner, sharing its top finish with Corsair's HX750i? Although is sports hybrid fan control that can be enabled with a switch, its fan is slightly louder than Corsair's, knocking it  back from a definitive victory.

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15 comments
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  • ahnilated
    MTBF 150hrs... Are you serious? That is very low for an average failure ratio.
  • Derza10
    So this PSU fails in 7 days of use on average? That can't be right...
  • ko888
    The MTBF is suppose to be >100,000 Hours.
  • razor512
    82043 said:
    MTBF 150hrs... Are you serious? That is very low for an average failure ratio.


    The unit quoted for those specs must have been using capxon brand capacitors instead of nichicon.
  • morerice
    I'm guessing the MTBF should be 150k hours instead.
  • ko888
    tomshardware.de reviewed that Seasonic Platinum-760 (SS-760XP2 Active PFC F3) and shows the MTBF as 150.000 hours. That may be the way they display 150000 in Germany by using a decimal point separator instead of the comma separator we use here in North America.
  • ahnilated
    Now they fixed the MTBF on the review. :)
  • royalcrown
    I've had this unit since mid 2013...why review it now ? A couple revisions, meh ?

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151120
  • DookieDraws
    I have the 660W version of this PSU. I'm running mine in Normal mode, as I am a little uncertain about the reliability in Hybrid mode. The bad about running the PSU in Normal mode; is that it will allow more dust to be sucked into the PSU in very dusty environments, that is if you have it placed down pulling air from outside your case. This is why I mounted my PSU up to pull air from inside the case, which I know some don't recommend doing. I just feel warm air from inside the case will be less harmful to the PSU than being clogged up with dust in a few short months if mounted down. Less cleaning to do, too!

    Also, these PSUs do come in very nice packaging. The cables are a little stiff to work with, but you can tell this is a high quality product. I'll stick with Seasonic for all my future builds!
  • texastim65
    I love the velvet bag that comes with the Seasonic power supply (1st picture). It's identical to the ones that Crown Royal Whiskey comes in. Very handy for holding my change or your kids marble collection :-)
  • Stevemeister
    These are excellent PSU's
  • mikegtp
    It looks identical internally to the Corsair AX760.
  • ralanahm
    I think they are the same made at Seasonic the sea sonic ones is $5 less online maybe they is some accessory in the box that adds $5.
  • wolverine96
    This looks like a very solid power supply. However, for the price, I would probably get a Gold rated PSU instead.
  • Montego
    @ko888 - Yes, in Germany unlike in America, the period (.) is used rather than the comma (,) to express thousands in a numerical string (i.e. 1,000 {American} = 1.000 {German}).