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Item#: N82E16817151094

SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

  • ATX12V V2.3 / EPS 12V V2.91
  • 80 PLUS BRONZE Certified
  • 100 - 240 V 50/60 Hz
  • +3.3V@24A, +5V@24A, +12V@40A, -12V@0.8A, +5VSB@2.5A

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the SeaSonic USA S12II 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 S12II 520 Bronze

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5 out of 5 eggsSolid PSU

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Easy to install and reliable

Cons: Slightly more expensive than Corsair, but worth it. Had issues with cheap corsair caps in the past and was recommended this instead. Very glad I went with it thusfar.

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  • Jeff B.
  • 3/30/2016 8:41:32 AM
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsMine is apparently a newer revision. Slightly different than pictured/described.

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Plenty of power, very quiet fan, relatively small.

Mine has two 6+2 pin PCI-E connectors, even though the specs state it has one 6+2 pins and one that's only 6-pin. The cables on mine are also different from what's pictured. They're all flat, black unsleeved cables except for the main 24-pin motherboard connector which is still sleeved. The fan no longer has the grill as pictured, it now has a full honeycomb mesh covering the entire fan surface. And the SeaSonic badge near the power switch is blue.

Cons: Absolutely nothing... some people might be a bit annoyed that the version shipping now is not identical to what's described here, but I like the flat cables and the honeycomb grill over the fan. The box, and the label on the PSU itself still says it's a Seasonic S12II Bronze.

Box says 3 year warranty; slip included in the box says 5-year warranty. But if this is anything like the other Seasonic (and Seasonic built rebadged units) I've used it will far outlive the warranty either way.

Other Thoughts: I bought the 620w version of this over a year ago, which is exactly as it is pictured and only has one 6+2 pin PCI-E connector; the other one is 6-pin only.

The appearance of the new 520w I received is virtually identical to the SeaSonic SSR-350ST 350W, which is another PSU I was considering purchasing before going with this one instead. Look up Newegg item# N82E16817151143

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  • Zachary D.
  • 3/29/2016 8:16:34 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsNice power supply, some issues though

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Whisper quiet, and runs my PC

Cons: When the computer sleeps, or hibernates it causes some confusion for the PSU and it will not supply power to the mobo.

Discovered this by accident, and had a technician come out to confirm. I'm not sure whether this is expected behavior or an isolated incident. Either way, be wary when purchasing if you're expecting absolutely smooth sailing.

Manufacturer Response:

Hi Zachary,

Thank you about your review and sorry about the problem you encounter. I have forwarded your problem and if you want to give us more info, kindly email us at: newegg@seasonic.com
Thank you and have a nice day.

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

1 out of 5 eggsNOT a 40A 12V rail, it is DUAL 12V 20A

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: says on the box a combined 12V 40 A

Cons: sticker on the PSU says 12V1 20A, 12V2 20A

Do NOT get this for a power hungry AMD R9

Manufacturer Response:

Hello,


Thank you for your message. This is indeed a combined 12V which means that you can have up to 40A on the rail. I have forwarded your comment to improve our explanations in the future.
Have a nice day.

0 out of 2 people found this review helpful. Did you? Yes No

  • John H.
  • 3/6/2016 5:06:43 PM
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsStill going 3+ years in ivy i5 system.

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Has been rock solid in the 24/7 usage ivy i5 system it was built for. Bought 9/12

Cons: Not modular, but knew that going in.

Other Thoughts: Wanted stability for the system that it was going into, and have definitely gotten that, and am still getting it. Was on sale when I got it, so that, along with the SeaSonic name made it a no brainer at the time.

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  • Robert A.
  • 1/23/2016 11:56:54 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsstabilized my computer

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Exactly what I would expect to pay for the quality. Fixed the computer having random slowdowns and reboots. Swapped an old FSP 500W unit out for this one. Seems like the old unit has had trouble being stable for many years but kept running. It had lower 12v combined, plus it was split rail. Glad to have one that's not split. This new unit has been in for over a month. Was prompted to actually install it when someone donated a newer graphics card to me, and it would reboot when starting a game. Instantly stopped doing it, and also gave me another 100mhz CPU o.c., which the old one wouldn't do when it was new. Not exactly using alot of voltage. One card, one CPU very slightly overvolted and with a 400mhz overclock. This is why we get power supplies 500W or better regardless of how much theoretical power your components will use.

Cons: None.

Other Thoughts: Recommend, but consider going 620W if it's not much different in price. I would even get a 750W unit if I wasn't at the time just looking for the lowest price for highest quality unit I could find.

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  • Stephen S.
  • 1/2/2016 2:10:46 PM
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsStill Going

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Size, quiet

Cons: Not modular

Other Thoughts: Didn't have a big budget to work with when I built my rig back at the end of 2011, this fit the bill mostly in price. Of course at that price it was not modular, but that is the only negative. Has run quiet and cool for 4+ years with no issues at all. I currently using it in my existing case with a new MB and a I7 5820K CPU, handling it just fine.
Considering the M1211 series for a new case, only with more power for a new graphics card.

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  • Jeffery P.
  • 11/20/2015 10:32:34 AM
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsFantastic Non-Modular PSU

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: I am running a server on this PSU and I am very happy with it, it is quiet, reliable, and stable. It can handle an overclock, and it is just another fantastic PSU from SeaSonic.

Cons: Not modular

Other Thoughts: I wish it was modular like my 520 EVO but it is still fantastic in a large case.

Manufacturer Response:

Hi Stacey, The S12II-520 is the Modular version of the M12II-520. If you wish to have the Modular version, then please consider the M12II / G / S12G / X / P / FL series. Thank you.

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5 out of 5 eggsQuality PSU

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: Bought to power a new i5 6600K/Gigabyte GAZ170X Gaming 5 build. Although listed as a tier 2 PSU on Tomshardware PSU tiers, this Seasonic unit is nearly perfect in terms of quality and performance. My voltages on all rails are within 1% and there is 0 fluctuation, regardless of load. Although the wattage is moderate, easily handles my overclock and GTX 970 with plenty of power to spare and is virtually silent. There is no better budget PSU. Cables, while not modular, are flat with plenty of connectors (2x6+2 PCIe) with the exception of the ATX cable, which is round and sleeved. Cable management is easy with a good case.

Cons: The only complaint is that the EPS12v cable could be a little longer. While I was able to route mine behind my ATX mobo (PSU bottom mounted), it is tight and difficult to plug in. Not a problem if using a smaller form factor mobo or running the cable on top the motherboard.

Other Thoughts: Google other reviews of this PSU. Its hard to believe the price for this one. I have owned several other Seasonic power supplies and they have all been stellar.

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

  • Baoyin c.
  • 9/26/2015 10:37:24 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsbad

This review is from: SeaSonic S12II 520 Bronze 520W ATX12V V2.3 / EPS 12V V2.91 80 PLUS BRONZE Certified Active PFC Power Supply

Pros: nothing

Cons: It sometimes works normally,but sometimes makes my house trip when I press power-button. When I found that problem was made by it,the numbers of date is nore than 30 days,I cannot refund or replacement this problem product.

Manufacturer Response:

Hi Baoyin, I am sorry for the inconvenience this has caused. If your home fuse is tripping, then perhaps you will need to check for possible short circuit or grounding issues either in your wall socket or possibly in your system. Please visit www.seasonicusa.com to start a RMA and please contact us via newegg@seasonicus.com if you have any issue or concerns. Thank you.

0 out of 6 people found this review helpful. Did you? Yes No

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Item#: N82E16817151094
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