Skip to: | | - A great place to buy computers, computer parts, electronics, software, accessories, and DVDs online. With great prices, fast shipping, and top-rated customer service - Newegg shopping upgraded ™

If you are reading this message, Please click this link to reload this page.(Do not use your browser's "Refresh" button). Please email us if you're running the latest version of your browser and you still see this message. - Computer Parts, Laptops, Electronics, HDTVs, Digital Cameras and More!

SeaSonic S12G S12G-550 550W ATX12V / EPS12V 80 PLUS GOLD Certified Active PFC Power Supply

Sold and Shipped by Newegg

Purchases from these Sellers are generally covered under our Newegg Marketplace Guarantee.
Marketplace Seller
  • ATX12V / EPS12V
  • 80 PLUS GOLD Certified
  • 100 - 240 V 50/60 Hz
  • +3.3V@20A, +5V@20A, +12V@45A, -12V@0.3A, +5Vsb@2.5A

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews

SeaSonic S12G Power Supply

The S12G Series, available in 450, 550, 650 and 750 Watts, provides superior dynamic response, greater system stability, and maximum 12VDC rail output. The 80 PLUS Gold certified power supply provides high power efficiency of at least 87% at any load between 20% and 100%, saving you money on your electrical bill, reducing heat in your hardware, and prolonging your computer's life. Intelligent thermal control ensures an optimal balance between silence and cooling.


SeaSonic S12G
  • DC to DC Converter Design
  • Conductive Polymer Aluminum Solid Capacitors
  • Highly Reliable 221°F (105°C) Aluminum Electrolytic Capacitors
  • Smart and Silent Fan Control (S2FC)
  • Active Power Factor Correction (up to 99%)
  • Ample +12V Output
  • 120mm Ball Bearing Cooling Fan
  • Multi-GPU Technology Support
  • Ultra Ventilation (Honeycomb Structure)
  • Gold Plated High Current Terminals
  • Soft-Rubber Mounting Cushions
  • Universal AC Input (Full Range)
SeaSonic S12GSeaSonic S12G

Product Information

1. Dimensions (L x W x H): 5.5 x 6 x 3.3 inches (140 x 150 x 86mm)

2. AC Input & DC Output Voltages / Wire Configuration

Model: S12G-450

SeaSonic S12G

Model: S12G-550

SeaSonic S12G

Model: S12G-650

SeaSonic S12G

Model: S12G-750

SeaSonic S12G


SeaSonic S12G

Learn more about the SeaSonic USA S12G-550

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's Standard Return Policy.
Ownership: 1 day to 1 week
Verified Owner
5/ 5
This is where Seasonic quality starts S12G 550w 80 plus GOLD 4/9/2017 8:00:00 AM

Pros: Quality, cool, quiet, solid foundation for a gaming pc.

Cons: Not modular

Overall Review: I have been building computers for 20 years now. Add a cheap power supply and your just asking for problems. Add a mid grade to highend Seasonic and you will be 100% happy you did. Reliable cool power is an amazing thing to experience.

0 out of 1 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Good for a few minutes 4/1/2017 12:12:56 PM

Pros: Easy install, and more than enough connectors for my modest build. has 3 velcro ties and zip ties for cable management. This model has good ratings.

Cons: Lasted less than 10 minutes. Unit had a rebate, but I had to wait for additional parts so I mailed the rebate in before ps was tested. Therefore even though this power supply only lasted 10 minutes I cannot return to newegg, and going thru Seasonic may not include free return shipping. I will continue to shop for the most bank for my dollar, but I will be avoiding rebates as the requirements can conflict with my schedule.

Overall Review: I searched reviews trying to find a reliable power supply, but I understand a faulty product can make it to a customer. It may be a rarity, but failure or doa seems to happen quite often, at least in the customer reviews I read here on newegg. Also I intend to use modular or semi modular with my next build.

1 out of 5 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Nice upgrade for my Dell XPS 3/20/2017 4:58:58 PM

Pros: - great fit & finish
- quiet, practically silent
- plenty of connecting cables with enough length for my case
- cool, all-black cabling
- great budget-minded PSU from a top maker
- 5yr warranty

Cons: - not modular, but knew that when purchasing

Overall Review: Was looking for a reliable PSU for a budget-minded upgrade to pair with a new Sapphire RX480 card. This fit the bill perfectly - top-notch manufacturer's mid-range product, but much better than the cheap Dell PSU in my 3-yr old XPS 8700. Plus it has the same exact dimensions, so no need to try to squeeze it into the tower. It's NOT a modular PSU, but just tucked the extra cabling into an empty drive bay where it won't inhibit airflow.

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Great PSU, very stable 2/24/2017 9:59:47 PM

Pros: Very stable hosting my Git repos with a 6700K at 4.5GHz.
Runs cool and silent with water cooling (details below).

Cons: None really.

Overall Review: I probably have 10 Seasonic high-end PSUs across various machines at this point.
In nearly a decade of heavy use I have had *zero* failures.
Cooling -- Corsair Hydro Series H80i V2 Water / 120mm
Case -- Cooler Master Elite 130 - Mini-ITX

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Great Product! 12/31/2016 8:02:19 PM

Pros: Works great, love the modular wiring

Cons: none that I have found

0 out of 3 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
1/ 5
Apparent Failure 10/8/2016 9:07:57 PM

Pros: Still looking...

Cons: Approx 3 hours after install it went "pop" and died.

Overall Review: exploring options

Did you find this review helpful?
Manufacturer Response:
Hello Phillip,

Thank you for your comment and sorry about the issue you have encountered. We always do our best to avoid such situation with a new product. May I suggest you to check our troubleshooting page ( and see if our Jump Start Guide can't help you to make sure that PSU is defective. You may need to unplug all cables first and wait a bit for PSU to discharge before using our Jump Start Guide. You can also contact us anytime at for any help or question.

Thank you.

Best Regards,
Seasonic Team.
3/ 5
It was decent for half a year, then... 10/2/2016 2:45:39 PM

Pros: - Supplies enough consistent power for my gaming setup at load
- Relatively quiet when it was working fine

Cons: - Short length of cables makes cable management difficult
- Cable connector quality seems to be lower than average (part of one just fell off)
- After half a year the fan started rattling and it's been making my system loud since

Overall Review: - It's difficult to recommend this product to someone if the manufacturer RMA process consists of the consumer sending the PS back, waiting 2-3 weeks, then receiving a new one in the mail
- Seasonic does not do Advance RMA, and has stated that they do not intend on providing it

1 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Hello Anonymous,

Thank you for your comment and sorry to hear about this issue. Unfortunately, we do not provide yet advance RMA and we are really sorry for this. We are also sure that the RMA process won't take 2 to 3 weeks. In USA, it's a matter of only few days and we will be glad to take care very wickly of your exchange.

Thank you.

Best Regards,
Seasonic Team.
Ownership: 1 day to 1 week
Verified Owner
5/ 5
Great PSU 7/26/2016 8:16:52 PM

Pros: It puts out juice.

Cons: Some cables weren't long enough for me, so I have to order adapters.

Overall Review: It's a fantastic stable piece of hardware and you really can't go wrong with SeaSonic ever honestly.

Did you find this review helpful?
ICON Loading...
Selected Items
  • Add to Wish List Found on 3 wish lists
Are you an E-Blast Insider?
Subscribe Newegg e-Blast
Shop without retyping payment details. Secure shopping made faster.
Check out with PayPal.

Condition Guidelines

The following guidelines apply to all product categories unless otherwise indicated within specific categories.

  • New : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty.
  • Refurbished : This means the product was tested and repaired as required to meet the standards of the refurbisher, which may or may not be the original manufacturer. Any exceptions to the condition of the item outside the manufacturer’s information should be provided in the listing, up to and including warranty details.
  • Open Box : Newegg only guarantees your receipt of the Open Box product with the purchase of this item. Any accessories MAY OR MAY NOT be included. Newegg will NOT send you any missing accessories, even if it is required to use all of the item’s functions.Open Box items usually do not come with manufacturer or vendor warranty or technical support. However, warranty support may be available if an item was never registered by a previous owner. Please contact the manufacturer to check.
  • Used - Like New : This means that the product has been opened, possibly used but is in perfect condition with no signs of cosmetic or functional defect. Product may includes warranty, and accessories found with the original product. Product may or may not be in the original packaging. Returned items with minor packaging defects fall under this category.
  • Used - Very Good : This means that the product has been opened, may show slight signs of use and cosmetic blemish, and may be missing minor accessories, but remain in excellent condition. Product does not come with warranty unless stated otherwise in product description.
  • Used - Good : This means that the product has been used, may show clear signs of use and may be missing minor accessories, but remain in good condition. Product does not come with warranty unless stated otherwise in product description.
  • Used - Acceptable : This means that the product shows clear signs of use, cosmetic defect, and may be missing minor accessories and manual, but remain in working condition. Product does not come with warranty unless stated otherwise in product description. Functionality issues beyond signs of use should be disclosed in product description.
Price Available at Checkout
Why can’t we show you details of this product?

Some manufacturers place restrictions on how details of their products may be communicated.

If the Adobe Reader does not appear when you click on a link for a PDF file, you can download Adobe Reader from the Adobe web site.