Seasonic Prime Ultra Platinum 1000W PSU Review

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Protection Features

Check out our PSUs 101 article to learn more about PSU protection features. Our protection features evaluation methodology is described in detail here.

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Protection Features
OCP12V: 113.917A (137.25%), 12.257V 5V: 33.4A (133.6%), 5.03V 3.3V: 31A (124%), 3.31V 5VSB: 4.1A (136.67%), 4.83V, 74.3mV Ripple
OPP1396.29W (139.63%)
OTP✓ (160°C @ secondary side)
SCP12V: ✓ 5V: ✓ 3.3V: ✓ 5VSB: ✓ -12V: ✓
PWR_OKOperates properly
SIPSurge: MOV Inrush: NTC thermistor & bypass relay

There is no OCP on the +12V rail, since over-power protection shuts the PSU down if needed. But with no load on the other rails, Seasonic's SSR-1000PD Ultra can deliver close to close to 114A on the +12V rail before it shuts down.

Over-current protection at 5V and 3.3V is normal. However, at 5VSB, it's higher than it should be; ripple gets out of control with more than 4A on this rail.

Other safety features are present and operate normally, protecting this PSU well.

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Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • Th_Redman
    I notice you didn't give it an award rating...what gives, if you present it with such high praise?
  • Aris_Mp
    It has an award. It is just not shown, yet :)
  • Kennyy Evony
    Lets all hope it doesn't kill your motherboard and all components like my SeaSonic did while only operating 1 year under light workloads. No matter how much change they make to PSU I would not trust a brand that would allow catastrophic results in using their products AND not accept responsibility for the loss.