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Item#: N82E16817151141

SeaSonic SS-1050XP3 1050W ATX12V / EPS12V 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply

  • ATX12V / EPS12V
  • Full Modular
  • 80 PLUS PLATINUM Certified
  • 100 - 240 V 50/60 Hz
  • +3.3V@25A, +5V@25A, +12V@87A, -12V@0.5A, +5VSB@3A
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SeaSonic PLATINUM 1050W Modular Power Supply



Ultra Tight Voltage Regulation
Improved load voltage regulation keeps the voltage fluctuations on the 12V output within +2% and 0% (no negative tolerance), and on the 3.3V and 5V outputs between +1% and -1%, which (under 80 Plus load conditions) results in smooth and stable operation.


Seasonic Hybrid Silent Fan Control - S²FC & S³FC*
The industry first, advanced three-phased thermal control balances between silence and cooling. The Hybrid Silent Fan Control provides three operational stages: Fanless, Silent, and Cooling Mode. In addition, there is a switch provided to allow for manual selection between the Seasonic S²FC (fan control without Fanless Mode) and the S³FC (fan control including Fanless Mode).


New feature - Hysteresis - is achieved by a fan control IC, which optimizes how frequently the fan switches on and off. At 77°F (25°C) ambient temperature the fan turns on when the load rises above 35% (±5%) and it turns off when the load drops below 25% (±5%). Due to this lag in response the fan switches on and off less frequently, which reduces power loss in Fanless and Silent Mode.


Dual Copper Bars
These pure copper bars conduct high current more efficiently to reduce impedance and minimize voltage drop.


80+ Platinum
The Platinum Series, certified in accordance to the 80PLUS highest standards, offers the newest technology and innovation for performance and energy savings with up to 92% efficiency and a true power factor of greater than 0.9PF.

Special Features
SS-1050XP3 SS-1050XP3
  • 1. 80PLUS® Platinum Certified Super High Efficiency
  • 2. DC Connector Panel with Integrated VRM (Voltage Regulator Module)
  • 3. DC to DC Converter Design
  • 4. Dual Copper Bars
  • 5. Active Power Factor Correction (99% PF Typical)
  • 6. Conductive Polymer Aluminum Solid Capacitors
  • 7. Highly Reliable 105°C Japanese Aluminum Electrolytic Capacitors
  • 8. Gold Plated High Current Terminals
  • 9. Ultra Tight Voltage Regulation
  • 10. High +12V Output
  • 11. Dual Sided PCB Layout
  • 12. Seasonic Patented Hybrid Silent Fan Control
  • 13. Sanyo Denki San Ace Silent Fan
  • 14. Ultra Ventilation [Honeycomb Structure)
  • 15. Full Modular Cabling Design
  • 16. Multi-GPU Technology Support
  • 17. All-in-One DC Cabling Design
  • 18. Easy Swap Connector
  • 19. Universal AC Input [Full Range)
  • 20. 7-Year Warranty
Product Information
Model Platinum-1050 (SS-1050XP³ Active PFC F3)
Intel Specifications ATX12V / EPS12V
Dimensions (L x W x H) 7.4 x 5.9 x 3.3 in. (190 x 150 x 86mm)
Efficiency 80 PLUS Platinum / Energy Star / ErP Lot 6 2013 compliant
Protection Features OPP/OVP/UVP/SCP/OCP/OTP
Hazardous Materials WEEE/RoHS
AC Input Range Full Range: 100 ~ 240V (Max. 90 ~ 264V), 13-6.5A, 50/60Hz
  • MB 24/20-Pin Connector x 1 (610mm)
  • CPU 8/4-Pin x 1 (650mm)
  • CPU 8-Pin x 1 (650mm)
  • PCI-E 8/6-Pin x 8
  • Peripheral 4-Pin x 5
  • SATA x 14
  • Aux. x 1
DC Output Voltage +3.3V +5V +12V -12V +5Vsb
Maximum Load 25A 25A 87A 0.5A 3A
Combined Load 125W 1044W 6W 15W
Total Output 1050W

In the Box


Learn more about the SeaSonic USA SS-1050XP3

Quick Info


  • Limited Warranty period (parts): 7 years
  • Limited Warranty period (labor): 7 years

Customer Reviews of the SeaSonic USA SS-1050XP3

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  • Ed R.
  • 1/23/2015 3:45:12 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsThe best PS? - maybe

Pros: One of the critical components in any electronics is having a stable, clean power supply. This one is very well built, and in my initial looking is very clean and stable. The power supply comes with high quality cables - and lots of them.

When you first un-package this device, you feel like you got a gift, not a power supply. These guys spent a great deal of time and thought on shipping, and packaging to ensure it arrives safe and in good shape. They also took care of "what to do with the extra cables" issue. you really don't want to discard them in the case you need them later, but hate to store unused stuff and become a hoarder. Their solution isn't perfect, but helps

Cons: none

Did you find this review helpful? Yes No

  • Thomas D.
  • 1/22/2015 11:06:58 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsWorked for 2 days

Pros: It worked for 2 days

Did not burn my house down

Cons: It died right in front of my and my client.

There seems to be a short somewhere near the input socket. Moving the plug around on 3 different cords cause power to come back on for a few seconds

Other Thoughts: I order from newegg every week, sometimes several times a week.
This supply is going in a $4K system for a client and it failed right in front of both of us.

The only saving grace here is NewEgg offered an advanced replacement option in this case.

I have installed and own many platinum and gold rated Seasonic power supplies and this is the first bad unit for me.

Manufacturer Response:

Hi Thomas, I am very sorry for the inconvenience. Can you please kindly write to us at and let us know what happened so we can report this to our HQ. We have many quality checks in place at our factory and we want to make sure everything is in working order. Thank you very much.

Did you find this review helpful? Yes No

  • Kyle H.
  • 12/25/2014 8:10:42 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsThe Cadillac

Pros: You can tell from the packaging that they care about their product. This PSU is obviously quality built and high-end, with the best energy efficiency rating you can get. I don't expect to need to utilize the warranty that came with this.

Cons: I probably would have been reluctant to buy this at normal price.

Did you find this review helpful? Yes No

  • Daniel L.
  • 12/21/2014 9:29:12 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat, High Quality PSU

Pros: > Very high quality PSU, cables, and packaging
> Runs silent (fanless) most of the time on Hybrid mode.
> No coil whine
> The specs are insane for what I paid ($134.99)
> 80 Plus Platinum is pretty much the best you can get in terms of energy savings
> Modular
> Cables were plenty long enough for my system (in a Fractal R4)
> 7 Years of piece of mind that I never have to get another PSU
> Powerful PSU from a top tier brand

Cons: Absolutely nothing other than the MSRP of this PSU is insane. I'm glad I got it on sale or else i'm not sure it would be worth what SeaSonic is asking for it. The PSU itself is solid and I have no reservations on the unit itself.

Other Thoughts: Upgraded from a Rosewill Xtreme 850 that had some coil whine. To put it bluntly, I am so relieved to not hear that irritating sound anymore while gaming.

Although my old Rosewill delivered pretty solid performance, I am planning to add another R9 290X to my build and having a more powerful and energy efficient PSU would be a boon to my system. 5/5, I highly recommend this SeaSonic if you can get it under $150, any higher than that and I would be less inclined to do so.

1 out of 1 people found this review helpful. Did you? Yes No

  • Ethan A.
  • 12/21/2014 4:48:49 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsTruly platinum

Pros: Amazing velvety bag.
high quality cables and an overall great workmanship
great power supply, actually fixed a hum/ feedback in my speakers caused by my old corsair.

Cons: none

Did you find this review helpful? Yes No

  • Patrick D.
  • 11/18/2014 9:53:23 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

5 out of 5 eggsgood PSU

Pros: This is a good power supply. It has been running quiet and stable for over a week now. The construction is solid and the quality of the wires are good

Cons: none so far

Did you find this review helpful? Yes No

  • Jason G.
  • 9/25/2014 9:25:45 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSeasonic at its best

Pros: Seasonic isn't as "pre-eminent" as say Corsair, Coolermaster, etc., but they are an ODM that has been building power supplies since 1975. In computer terms, they're one of - if not the - oldest and most established brands in computing. This PSU, being Seasonic's 1050w version, is no exception. It's a no-frills, legitimately 80 Platinum, PSU that gives seven years' warranty, and doesn't require a Degree in Computer Science to figure out what's going on.

I upgraded my PSU from an RM850 (not a bad PSU) because my 780 Ti Classified stressed it out to where it could only deliver 11.8v to the GPU at gaming / benchmarking load at stock clocks. This PSU, with not only more efficiency, higher wattage, and better 12v delivery, provides not only a tighter-to-12v tolerance (12.05 to 12.06v at the GPU), but less voltage fluctuation (the 12v at the 780 Ti stays put at 12.06v, whereas the RM850 would fluctuate between 11.77v and 11.8v). For OC'd GPUs, this voltage consistency is very important for stability (whether it's factory OC'd, or OC'd via third-party means).

Also, the PSU switches are a huge pro. The back switch is ENORMOUS, which not only makes it easy to turn on and off the PSU (I do this because my motherboard has a "breathing effect" that "nightlights" my room, but there is a 2nd, smaller, switch that allows you to control the fan spin-model. It can be confusing, but if the O-position is locked in, the PSU is in fanless mode until it reaches 35 Deg C, at which point it spins up. The I mode is the more traditional "always-on" mode. I prefer "always-on" simply as a matter of knowing it's on, but for those who wish to have one less fan contributing noise, it's a welcome option. Compared to the RM, which was arbitrarily silent until at 30% load, this can be more reassuring as the fan is always on.

Build quality is incredible. Thick paint on the grey fan cover, a clear and detailed breakdown of each rail's capabilities, and a public disclosure of 80 Plus Platinum certification. All of the capacitors are japanese (Nippon Chemi-Con and Rubycon, if my memory serves), and the plugs from the cables into the PSU, as well as into the applicable components are solid, and although they may require some force for full connection, once they're in, they click, and that's it. The force needed may be a bit more than one is used to, but the build quality is such that the connection-result is going to ultimately outweigh reservations. Having a Sanyo Denki 120mm fan doesn't hurt either... more insane build quality there.

Lastly, the price for what you get. You get a platinum seasonic PSU (where you don't have to investigate who actually built your PSU), at a cost that is reasonable for what Seasonic offers. No, it's not "valuemax" or some other brand where you save $50 and get cheap internals, I'd rather put my money towards a tank of a PSU, than save $50 on the PSU and have to buy new components after a PSU's demise.

Cons: First, the amount of force needed to put in the connectors at both the PSU end as well as the component end, can be a bit off-putting to new builders, or those expecting "easy-to-insert" clicks. Additionally, with the connectors, the 24-pin connector's PSU side is a bit unusual; it's a 9-pin and a 5-pin. This is fine, but the amount of cabling provided to daisy-chain the two is a bit short (and the resulting cable is a bit stiff. It may not be a problem in larger cases (ie: 750D-class), but in the Obsidian 350D that this is housed in, it requires patience and precision to properly plug in the connectors.

Second (and admittedly, this one is quite subjective), Seasonic doesn't include a console suite that allows the end-user to monitor power properties of the PSU. This one's subjective in the sense that although Corsair and other companies have been promoting various power monitoring utilities, Seasonic chooses to limit the "user-interface" to the "fan-mode" switch. The benefit is simplicity in operation, but the cons are more for diagnostic purposes... is my PSU giving me its advertised efficiency, how many watts am i using in gaming / benching / OC mode, how are my PSU's internal temperatures, etc., To have an option that would allow me to view these properties - if I elected to do so - would be a nicety that would allow end-users to determine what they're using relative to the PSU's actual capacity.

Lastly, (again, subjective since it's in a smaller-than-desired rig) I would have liked for the 24-pin connector to have been flat. Yes, it fits in my 350D's "cable management area", but the fit is very tight and I have to make sure no other wires are crossing its path. Otherwise my case won't close. It's not a knock on the PSU, because it's intended for larger cases with more cable management room, but it has to be known that its 24-pin cable may remove it from the top of your "small form factor" build list.

Other Thoughts: This is a no-frills, high-quality PSU that may lack software to wow you (or software to let you know the health of the PSU), but makes up for it with a 40-year reputation, simplicity in use, and sheer quality. Although I only run one 780 Ti Classified and a mildly OC'd 4790K with a Swiftech H220x liquid loop for cooling, knowing that I have room to expand for SLi'ing future GPUs, as well as knowing that the power delivery will be consistent to power-hungry components, is what mattered most to me. The SS-1050 XP3 by Seasonic does this.

This PSU's closest cousin is the Cooler Master V1000, and although they share many of the same parts, the quality on the Seasonic edition is higher (bigger capacitors for not only better power delivery, but sufficient power to survive the "16ms power loss test" where power is dropped for 1hz. It's not as typical of a test as say, voltage consistency under heavy load, but it's nice to know that Seasonic takes this into consideration when building its PSUs. It's also Platinum vs. the V1000's gold rating.

Another thought: The baggies that hold the cables, as well as the faux-velvet bag the PSU arrives in, are nice touches that let you know you bought a premium product. I like that, and although it's commonplace, I like Seasonic's presentation the best. Simple, but effective.

One thing I will say, I wish Seasonic made larger PSUs - since at this level (ie: over 1000w), many are making 1500w PSUs (ie: Lepa G1600, Corsair AX1500i, EVGA 1600 G2 / P2, etc.,) designed for 4-way SLi and / or extreme overclocking. And perhaps an 80 Titanium PSU. Seasonic's reliability is insane, but there's nothing wrong with pushing the boundaries of what's possible in the process.

But that's just reflections... as a PSU, this one's a keeper.

Manufacturer Response:

Hi Jason, Thank you very much for the very nice detailed review.

For the connectors, I will pass your findings to our QA and they will control this with our factory to make sure the specifications are correct.
As for the console suite, I am sorry, but it is not availible at this time for our products.
As for the flat 24Pin connector, this can be interesting but we have to deliver cable types which are usable for the majority of the system builds. Nevertheless, I will pass this note to our product managers for review.
In terms of higher power output, I will pass this to our product manager as well, but the market trend seems to be moving to the lower power consumption systems.

Thank you again for the very nice review and I hope our power supply will serve you well for many years to come.

12 out of 12 people found this review helpful. Did you? Yes No

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Item#: N82E16817151141
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