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SeaSonic USA > 
Item#: N82E16817151076

SeaSonic SS-400ET Bronze 400W ATX12V V2.2/EPS12V 2.91 SLI CrossFire 80 PLUS BRONZE Certified Active PFC Power Supply - OEM

  • ATX12V V2.2/EPS12V 2.91
  • 80 PLUS BRONZE Certified
  • 47 - 63 Hz
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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The SeaSonic SS-400ET  power supply comes with 400W power output and is compliant with ATX12Vv2.2 and EPS12V2.91 standards, offering stable power delivery for all your components.  Certificated for 80 PLUS Bronze, this active PFC unit runs at up to 85% (or higher) efficiency while delivering a 50% load. The cooling is handled by a 120mm fan with low noise level. 

  • newegg ATX12V and EPS12V Compatible Compatible with the ATX12V v2.2 and EPS12V2.91 standards, the SeaSonic SS-400ET provides maximum power stability to drive the processors as well as other components for desktop and server computer systems.
  • newegg 80 PLUS Bronze Certified The 80 PLUS Bronze certified power supply provides high power efficiency of at least 82% at any load between 20% and 100%, saving you money on your electric bill, reducing heat in your computer's system, and prolonging its life.
  • newegg 400W Maximum Power A maximum power of 400W delivers safe, reliable output for mid-range computer systems. Dual industry-leading independent +12V rails are provided for more stable and safer power output.
  • newegg 120mm Cooling Fan The SeaSonic SS-400ET Bronze power supply features a 120mm fan for increased overall airflow and heat dissipation in the power supply enclosure. Plus, the hexagonal grids on the back panel helps intake plenty of airflow to keep the power supply cool and operating at peak performance.

Learn more about the SeaSonic USA SS-400ET Bronze


SS-400ET Bronze


ATX12V V2.2/EPS12V 2.91
Maximum Power
12cm Double Ball Bearing
Main Connector
SLI Ready
Haswell Support
CrossFire Ready
80 PLUS BRONZE Certified
Over Voltage Protection
Input Frequency Range
47 - 63 Hz
>100,000 Hours
CUL, TUV, CB, CCC, CE, FCC, C-tick
5.9" x 5.5" x 3.4"


PCI Express & Serial ATA ready

Double forward converter circuit

High efficiency and reliability

Low ripple & noise

Super low noise fan control

Short circuit protection on all outputs

Over power protection

100% hi-pot test

100% burn in, high temperature cycled on/off

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the SeaSonic USA SS-400ET Bronze

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  • kristopher r.
  • 7/26/2014 4:36:26 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsWas working well

Pros: Worked just fine for a little over a month, WAS a good deal

Cons: After vigorous troubleshooting, i found out that the supply was intermittently flaking out, causing hard restarts

Other Thoughts: Built a cheap fast PC for the grandparents, all was well for a month, then it started to randomly restart without warning. After troubleshooting everything else, i pulled a good supply from the computer I'm typing this review on ( it uses a high end seasonic supply at that) and the other computer no longer randomly has hard restarts. I put this suspect supply in my PC, and presto! hard restarts after a few minutes. I'll report back after the RMA process is resolved with Seasonic.

Manufacturer Response:

Hi Kristopher,
Sorry for your experience with our product. Was your system a Haswell system? It is possible the issue is the result of compatibility issue. The 400ET is normally used by system integrators who builds configurations according to their exact needs and for consumers we recommed the Seasonic Retail units such as the G, P, X & FL series. If you have any issues, please contact us via this e-mail address: Thank You.

Did you find this review helpful? Yes No

  • Anonymous
  • 7/20/2014 10:05:49 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsA basic, high quality psu

Pros: Very heavy and is built sturdy. Fan is virtually silent and the PSU has plenty of connectors. Powers the machine it is in really well! BRONZE certified

Cons: Doesn't come with a box, it arrives surrounded by bubble wrap. More of an FYI then a con

Did you find this review helpful? Yes No

  • Colin B.
  • 7/15/2014 12:38:38 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsPlenty of connectors

Pros: Runs nice and quiet, wires are nice and long, and has plenty of connectors.

Cons: For me having not come with a power cord is a bit odd, but it is advertised as OEM,

Other Thoughts: chances are there will be plenty of wires that you won't use. Make sure to coil them up, rubber band them, and tuck them into that spare bay to keep them from causing other problems (like shorts, air flow issues, etc). Just saying.

Did you find this review helpful? Yes No

  • Dave G.
  • 7/8/2014 4:03:46 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsLasted 5 months

Pros: When it worked it was quiet and efficient.

Cons: I had always heard that Seasonic made the best power supplies, so when I wanted to replace a generic media center power supply that came with the HTPC case, I figured it was the perfect time to try a lower-end, inexpensive Seasonic power supply. Unfortunately, this Seasonic power supply only lasted from the delivery/installation date of 03MAR2014 until today, 08JUL2014, when I noticed the living room media center was not powered on. Hooked up a power supply tester to it and no beeps or anything, that's how dead it was. So, I had to put in the generic old Apevia Turbolink power supply that came with the media center case. Oddly enough, that super generic power supply still works fine after 3 years.

Manufacturer Response:

Hi Dave, I apologies for the inconvenience. Please visit and we will try to resolve your issue as soon as possible. Thank you.

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

  • William L.
  • 6/13/2014 1:18:57 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsQuality Mid-Priced Selection

Pros: After a power surge smoked my low-priced power supply of another brand, I decided I needed to spend a little more money to get a brand I have almost standardized on because of high quality - Seasonic. I was pleased to see a variety of power output models available - all rated highly. I was shooting for 400W, so this filled the bill. I was repairing an old computer, so the mix of Molex and SATA cables came in handy (I had carefully looked at the product picture to assure this availability). Installation was a snap (being OEM, you get a lower price in return for using your old power cord and screws), and the old unit fired right up, stable as a rock (the aging power supply this replaced was causing random reboots and USB port problems).

Cons: None. This unit came up on line routinely, just what you want. Just plenty of stable power.

Other Thoughts: If you are getting mysterious reboots from "random" causes, be sure to think about checking out the power supply. A new one is well worth the investment!

Did you find this review helpful? Yes No

  • 6/4/2014 2:20:41 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsGreat power supply, no frills

Pros: - High efficiency
- Plenty of adapters
- Silent fan

Cons: - I didn't use any of the molex adapters, so that was a bit of a waste. Molex seems to be becoming more legacy, as SATA power and the 8-pin and 6-pin ports are powering most peripherals/add-ons.

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  • james o.
  • 5/12/2014 7:30:20 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsfantastic

Pros: great inexpensive power supply, in my honest opinion unless you need a modular power supply this is the best psu for the money in this price range. I have a dozen of these in service right now.

Cons: none, just be aware that this does not include mounting screws or a power cord.

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  • Chad H.
  • 4/8/2014 11:41:37 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: Does what its suppose to, cheap

Cons: None

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  • Juan B.
  • 3/6/2014 10:54:30 AM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsA really good power supply

Pros: Installs easily, works like a charm. Good old-fashioned design and wiring appeals greatly to me - I'm tired of all these tightly sleeved and dark-colored PS units (it's nice to see something designed for us old-fashioned computer fans).

Cons: OEM unit, so no box, power cable, or screws; that's fine though, I have plenty of those around.

Other Thoughts: A great replacement for my old Pentium 4 Northwood build, now configured as a Win9x retro-gaming computer. All hail Seasonic!

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  • James M.
  • 1/19/2014 4:58:13 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsReally Good PS

Pros: Very good well built and heavy power supply for not a lot of cash.

Cons: no sheath on wiring - could use one where it exits the case

Other Thoughts: definitely like Seasonic power supplies

Did you find this review helpful? Yes No

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Item#: N82E16817151076
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