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SeaSonic USA > 
Item#: N82E16817151093

SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

  • ATX12V v2.3 / EPS 12V v2.91
  • Full Modular
  • 80 PLUS BRONZE Certified
  • 100 - 240 V 50/60 Hz
  • +3.3V@24A, +5V@24A, +12V1@20A, +12V2@20A, -12V@0.8A, +5VSB@2.5A

IronEgg
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
BUY WITH CONFIDENCE
This product qualifies for the Iron Egg guarantee. We'll match any qualifying competitor's price.
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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the SeaSonic USA M12II 520 Bronze

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

Customer Reviews of the SeaSonic USA M12II 520 Bronze

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Showing 93 of 93 reviews - Clear Filters

  • Matthew A.
  • 8/16/2015 5:22:17 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsLove it

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: It works, it's modular, the 24pin cable is a little stiff but I've come to expect that from most units. Overclocking my CPU isn't an issue to the slightest.

Cons: None that I can think of

Did you find this review helpful? Yes No

  • CHAPLIN T.
  • 8/7/2015 7:50:39 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsAnother Excellent SeaSonic PSU

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: Has been operating at more than rated output for years.

Cons: None.

Other Thoughts: Okay, I messed up... I installed an "old" GTX 670 in my HTPC after upgrading another computer. I forgot that the HTPC had this PSU in it, along with an old AMD X4 965 CPU. Amazingly, it ran fine for months before I started to get screen artifacts. Did some troubleshooting, and thought that the PSU was bad, so I pulled it out to RMA it to SeaSonic. Guess what? This is thing is only rated for 520 watts. I thought it had a 750 watt unit in it. The PSU is fine, and it's amazing that it even booted up, much less ran nonstop for months!

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  • Patrick A.
  • 5/25/2015 10:16:12 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsSolid quiet power supply

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: Solid running power supply, with clean rails after 3 years (O scope checked).

Cons: not more than 100% efficient. :p

Other Thoughts: System: AMD Phenom II 1045 T, MSI 990FXA-GD80, 2 Hard drives SATA RAID 1, AMD HD 6850 GFX, OpenSuSE 13.2.

120 Watts idle, 230 Watts multicore compile in the background while playing a game in foreground.

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  • Cindy V.
  • 3/25/2015 8:56:53 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsLove it.

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: PSU is absolutely fantastic. Delivers steady, reliable power. Being fully modular is also a HUGE plus for me. Cable management is not my strong suit......

Cons: I truly have nothing bad to say about this product.

Other Thoughts: I would certainly buy this item again.

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

  • Aaron W.
  • 1/14/2015 6:25:00 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsDOA

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: N/A

Cons: No power upon arrival.

Other Thoughts: Didn't use with any other computer parts in the event there's a short circuit and could fry something. I simply plugged AC into a wall outlet and tried turning on, no fan spin, nothing. Tried the paper clip jump method, still nothing. I had a feeling this would happen considering the recent QC issues Seasonic has been having. Probably will try a different company.

Manufacturer Response:

Hi Aaron, sorry to say, but for the power supply to work properly, you need to plug in the MB and components. If you have any questions or concerns, please contact us at: newegg@seasonicus.com

0 out of 7 people found this review helpful. Did you? Yes No

  • Christopher K.
  • 12/14/2014 7:39:14 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsDOA

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: none yet

Cons: DOA

Manufacturer Response:

Hi Mary, I am sorry for any inconvenience this may have caused you. Can you please kindly write to newegg@seasonicus.com and please let us know what happened and also if this issue has been resolved. Did you resovle it via NewEgg RMA or direct with Sea Sonic USA? Thank you and happy holidays.

1 out of 5 people found this review helpful. Did you? Yes No

  • Michael C.
  • 12/1/2014 11:26:58 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsDOA

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: None

Cons: The PSU came DOA (Dead on Arrival). I made the mistake and put everything together in the case before testing to see all the new products work and when trying to boot the new computer it doesnt turn on. Turns out after testing the PSU it is dead. 4 hrs down the drain of putting together and cable managing everything perfectly.

Other Thoughts: Dont buy this, I will stick with OCZ or Corsair now.

Manufacturer Response:

Hi Brandon,
I am sorry for the inconvenience this issue has caused. We do our best to ensure top quality and this issue will be reported to our Quality Team. In the meantime, please contact NewEgg for RMA service or you can contact Sea Sonic USA directly and we will sort this out for you as soon as possible. If you have questions or concerns, please contact me at newegg@seasonicus.com Thank you.

1 out of 4 people found this review helpful. Did you? Yes No

  • Anonymous
  • 10/2/2014 6:09:48 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsDid the job

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: I highly recommend this PSU. After going through a PSU nightmare with my most recent build this one did the job and literally had the perfect cables to go with what I needed. Even came with a sticker! I'll be going with Seasonic on my next build as well.

Cons: Doesn't come in variations of colors to match my sleuth of cathodes, LEDs and interior decor... I guess that's not really a con lol.

Did you find this review helpful? Yes No

  • Anonymous
  • 6/29/2014 2:55:05 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsGood stuff

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: quiet, modular, decent efficiency

Cons: None

Did you find this review helpful? Yes No

  • Chase H.
  • 5/10/2014 4:13:27 PM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggswell, its semi modular

This review is from: SeaSonic M12II 520 Bronze 520W ATX12V v2.3 / EPS 12V v2.91 SLI 80 PLUS BRONZE Certified Full Modular Active PFC Power Supply

Pros: It works as it should and as advertised

Cons: doesn't boast a great cable selection
Hard to screw into my case
cords didn't reach well to everywhere i wanted them to go

Other Thoughts: im not docking an egg because it is a semi modular PSU and it works fine.
Be aware of what youre buying.

Did you find this review helpful? Yes No

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Item#: N82E16817151093
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