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

Ships from United States.

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  • ATX12V V2.3 / EPS 12V V2.91
  • 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

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews


SeaSonic USA S12II 520 Bronze

Today, Sea Sonic Electronics launches the S12II "Bronze" Series - the updated version of the award winning S12II Series - to meet the growing demand for high efficiency and yet price-competitive power supplies.

The S12II Bronze Series achieves the 80 PLUS® Bronze standard of at least 82%, 85% and 82% power usage efficiency at 20%, 50% and 100% operating loads respectively. This, combined with Active Power Factor Correction, enables the S12II Bronze to reduce energy waste, boost power efficiency and more importantly, reduce energy costs for you.

In addition to the efficiency upgrade, the S12II Bronze Series maintains the strong foundations of the S12II series. Important features such as the stable and proven Double Forward Converter circuit design, the industry-leading Smart and Silent Fan Control (S2FC) and the use of high reliability, Japanese-brand capacitors are all carried forward in the "Bronze."

The S12II Bronze Series, similar to its predecessors, is available in the standard ATX form factor and in wattages that are most common for a PC system. In addition to the all-in-one cabling design, the 520W and 620W models come with additional EPS connectors for IPC and server systems, and supports both 6P and 8P PCI-E connectors for the most current and high-end dual graphic cards.


1. AC Input and DC Output Voltages (100V ~ 240V, 50Hz / 60Hz )


2. Dimensions (HxWxD): 86mm x 140mm x 150mm

3. Total Protection

Over Voltage / Over Power / Short Circuit Protection
Total protection for your power supply, your system, and you.

4. Operating Environment

Operating temperature: 32°F to 122°F (0°C to 50°C). Relative Humidity: 20% to 80%.
(The rated power will reduce from 100% to 80% from 104°F to 122°F (40°C to 50°C)
 
 

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
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by Newegg.com's Standard Return Policy.
5/ 5
Quite !!!

Pros: Just installed and this is the quietest power supply I have ever not heard.

Cons: Wiring is very stiff and for my application the main power 24pin feed is way to long.

Other Thoughts: I would recommend this to anyone and the only thing I would change would be to make the wiring a little less stiff

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Ownership: 1 week to 1 month
Verified Owner
5/ 5
excellent, They pulled all the stops on this one.

Pros: It works well, It comes with a bunch of nice premium cable management, a cool sticker badge, a power cable, and has more connectors than I expected for a 520 watt power supply. The quality is real good.

Cons: well the holes on my case were about a millimeter off on one of the holes but the case is ancient. I got it to fit fine after some shifting.

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Ownership: 1 week to 1 month
Verified Owner
1/ 5
DOA

Pros: None

Cons: I wish I could give this 0 eggs. Came defective. Wouldn’t even turn on. Now I have to pay a shipping fee and taxes to return it. Plus its gonna take another week. Never buying from Seasonic ever again. There are like 12 other people that are saying the same thing. Don’t buy it.

Did you find this review helpful?
Manufacturer Response:
Dear Anthony,

Thank you for your comment and sorry for this issue. A failing PSU may happen and we are sorry for this. Rest assured that our S12II is our most relieable Series so far and if you just received it, please kindly contact Newegg to ask for an exchange. Else, we will gladly handle your RMA and for this you can fill in our online RMA form available down this page: www.seasonic.com/support
Any questions or comment, please contact us at usa@seasonic.com or newegg@seasonic.com

Thank you and once again, sorry for the inconvenience.
Best Regards,
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Perfect! fit the bill

Pros: I had to replace a Bestec 300 Watt in a older Compaq Presario, I was getting random reboots and suspected the PSU given the age of he PC. I purchased an ATX power supply tester and sure enough the PSU was failing on the +/- 5 volts, which was jumping up and down causing the tester to beep when going too high. I was initially looking for a 350 to 400 watt since I don't need much for his system, however I wanted good brand name and the 520 Watt was the lowest Seasonic model Newegg had. The price was what I was looking for, the quality of the construction was very evident after I took it out of the box. I went ahead and tested it before installing it. The voltages were perfect and rock solid. It is much quieter than the old PSU so I sometimes wasn't sure the PC was even running if the monitor was off and I was walking by. As one of the other reviews stated, all of the cables being black is a little harder to see at first but a minor issue. So far so good 4 months.

Cons: None, especially for the price.

Other Thoughts: If have an older system or are building budget rig this seems to be a very good choice, especially if the video card does not require the PCI Express conector. I am sure it will handle some mid range graphics cards that do require the PCI express connector with no problem, however I am sure a higher wattage would be preferable when building gaming systems.

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Ownership: 1 week to 1 month
Verified Owner
5/ 5
It works but I warn you....

Pros: This power supply is exactly what I expected. For a low range build like mine it is a ok but if you plan on going for a *i-9 with dual titan 1080’s* I would recommend more power.

Cons: None

Other Thoughts: Works for me

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
1/ 5
Intermittent power and clicking noise...bad PSU

Pros: None

Cons: When I hooked up the PSU and flipped the switch the PSU made an intermittent clicking sound with no fan movement and failed to bring my motherboard to life. When the unit finally decided to start running (after many tries) it still made the clicking sound but eventually went quiet. The unit ran fine for about an hour and then suddenly cut off. Now, it will start occasionally but is anything but dependable. I've had many PSUs in the past from Corsair and EVGA and none have had any issues like this SeaSonic. This unit certainly does not perform to any quality standards. Unless you want a PSU that leaves you guessing as to whether it is going to work when you hit the power button, do not buy this product. I made the mistake of sending in the UPC for rebate before testing the unit.

Other Thoughts: Would not recommend.

0 out of 3 people found this review helpful. Did you?
Manufacturer Response:
Hello Devin,

Thank oyu for your comment and sorry for this issue. We always do our best to avoid such situation and issue with our PSU but it may happen that one will fail and we are sorry for it. Please, kindly apply for RMA directly to us: www.seasonic.com/support and we will take care of this.

Once again, sorry for the inconvenience it may have caused as it's not reflecting thez overall quality of this S12II-520.
Thank you.
Best Regards,
Ownership: 1 day to 1 week
Verified Owner
5/ 5
9.7/10 on jonnyguru :-O

Pros: I got this unit after reading the review on jonnyguru. 9.7 out of 10!
-Build quality: very good. Certainly does not feel like a budget power supply
-Japanese capacitors (In a budget power supply!)
-Fan is really quiet

Cons: -SeaSonic needs a better logo design if they want to get into the DIY gamers market.

Other Thoughts: I bet this is one of the only PSU in this price range that uses Japanese capacitors with silent fan. SeaSonic has been making power supplies for a very long time. Highly recommended.

1 out of 1 people found this review helpful. Did you?
1/ 5
had one of these purchased elsewhere

Pros: very quiet

Cons: killed motherboard after 1year moderate use. started smelling something burning electrical smell. powered off the system, tried to power it back on and found motherboard and PS dead. never trust seasonic like EVER.

Other Thoughts: do not ever trust seasonic power supplies.

0 out of 9 people found this review helpful. Did you?
Manufacturer Response:
Hello,

Thank you for your comment and sorry for this issue.
In order to assist you on this, please contact us and we will glad to test your PSU for compliances. The way a PSU is working and the safeties included to it, it's possible that it was also a motherboard issue. For this, please start your RMA process here, down the page: www.seasonic.com/rma

Thank you for your comment and once again, sorry for the inconvenience it may have caused.
Best Regards,
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