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Seasonic M12II-520 Bronze 520W EPS12V 20/24PIN ATX PFC 80+ Modular 6PIN PCI-E 120mm

Seasonic M12II-520 Bronze 520W EPS12V 20/24PIN ATX PFC 80+ Modular 6PIN PCI-E 120mm - 1
Actual product may not be exactly as shown.
Seasonic M12II-520 Bronze 520W EPS12V 20/24PIN ATX PFC 80+ Modular 6PIN PCI-E 120mm - 52175_l.jpg Seasonic M12II-520 Bronze 520W EPS12V 20/24PIN ATX PFC 80+ Modular 6PIN PCI-E 120mm - 52175_1.jpg Customer Photos (0)
Seasonic Electronics
Reg. Price: $99.99  CAD
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SKU: 52175
Shipping Weight: 5.6lbs

Part #: SS-520GM

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Product Videos [ Edit ]

Features [ Edit | History ]


Sea Sonic Electronics launches the M12II "Bronze" Series, the new and upgraded version of the M12II "Bronze" Series in response to the growing demand and anticipation for more energy-efficient products. The M12II Bronze Series inherits the same output and wattage options as well as the superb quality and ultimate silence from the M12II Series. The M12II, available in 500 watts, offers buyers with a mid range power output solution with cable management, to meet their exact system needs; cable management is now made easier than ever.

The M12II Bronze Series achieves the 80 PLUS Bronze standard of at least 82%, 85% and 82% efficiency under 20%, 50% and 100% operating loads respectively. Combined with Active Power Factor correction (Active PFC), the M12II Bronze reduces energy waste, boosts power efficiency and more importantly, helps the users to save energy and reduce electricity bill.

Quick Specs:
  • IPC
  • Computer
  • Workstation
  • Server
Efficiency 87%
Input Voltage 110 V AC 220 V AC
Output Power 520 W
Limited Warranty 5 Year
Output Voltage 3.3 V DC @ 24 A 5 V DC @ 24 A 12 V DC @ 20 A -12 V DC @ 800 mA 5 V DC @ 2.50 A
Form Factor Internal
Height 3.4"
Width 5.9"
Depth 5.5"
Number of Fans 1
Green Compliant Yes
Green Compliance Certificate/Authority RoHS WEEE 80 Plus Bronze
NVIDIA SLI Supported Yes
Number of +12V Rails 2

Specifications [ Edit | History ]

General Information  
     Brand Name: Seasonic
     Manufacturer: Sea Sonic Electronics Co., Ltd
     Manufacturer Part Number: SS-520GM
     Manufacturer Website Address:
     Product Model: M12II-520
     Product Name: M12II-520 ATX12V & EPS12V Modular Power Supply
     Product Series: M12II
     Product Type: ATX12V & EPS12V Power Supply
     Receptacles: 1 x 20+4pin ATX Motherboard
1 x 4-pin ATX12V Motherboard
1 x 8-pin EPS12V Motherboard
6 x 4-pin LP4 Peripheral Device
2 x 4-pin SP4 Floppy Drive
6 x Serial ATA
1 x 6-pin PCI-E
1 x 6+2pin PCI-E
  • IPC
  • Computer
  • Workstation
  • Server

     Green Compliance Certificate/Authority: RoHS
80 Plus Bronze
     Green Compliant: Yes
Physical Characteristics  
     Depth: 5.5"
     Form Factor: Internal
     Height: 3.4"
     Width: 5.9"
Power Description  
     Input Voltage: 110 V AC
220 V AC
     Input Voltage Range: 100 V AC to 240 V AC
     Number of +12V Rails: 2
     Output Power: 520 W
     Output Voltage: 3.3 V DC @ 24 A
5 V DC @ 24 A
12 V DC @ 20 A
-12 V DC @ 800 mA
5 V DC @ 2.50 A
Technical Information  
     Efficiency: 87%
     Number of Fans: 1
     NVIDIA SLI Supported: Yes
     Power Factor Correction (PFC): Active
     Protection Type: Over Voltage
Over Power
Short Circuit
     Limited Warranty: 5 Year

Customer Reviews of Seasonic Electronics SS-520GM

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Seasonic Electronics SS-520GM reviews.
Experience: 1 Months


High quality build
Good warranty
Cons Price if not on sale


Overall it's a solid, quiet and stable PSU.
But I wouldn't pay full price for it.

Experience: 4 Weeks

Verified OwnerVerified Owner


Good price on sale
Good warranty
Solid reviews
Cons Monochrome (black) wiring
Manual poor


I bought one of these as a spare since it was on sale for a very reasonable price (about $60) for a unit of this capacity, quality and features. Online reviews were consistently favourable, so it was an easy decision.

In the box, the usual accessories were included: case badge, mounting screws, and power cord (not always included with some PSUs these days). Aside from the modular cables, a little cloth bag for storing extra cables was included.

Although this may not be an issue for most people, or even some people most of the time, I was surprised to see that the modular cables used all black wires. This may be considered more aesthetically pleasing by some, but does make identifying the various leads more difficult, for testing purposes for example. Pretty classic case of function taking a back seat to form, which is a practice that I personally detest in principle. I usually test components after receiving them to ensure that they are functioning correctly, and with a PSU I jump the green power on lead and a black ground lead, then use a multimeter to test voltages. With this PSU I was forced to assume the locations of the required leads and therefore I needed to dig out a motherboard and connect that instead, just to be safe. But no deal-breaker, just an annoyance.

The manual is pretty basic and generic, and contains few pictures or diagrams. This would be particularly useful in relation to connecting the modular cables to the PSU, since what-goes-where is not intuitively obvious. Most people should be able to figure it out, but the purpose of a manual is to make such things clear.

The appearance of the power supply is certainly understated, with virtually no bling whatsoever. Personally, I don't mind this, especially since I have never owned a windowed case so I can't see the PSU once it is installed anyway.

This PSU is fully modular, including the ATX mainboard power cables. I find the latter entirely unnecessary, since connecting it is essential to the use of the PSU anyway. The main ATX cable is the typical mesh-sleeved bundle (and also typically stiff). The other leads are flat unsleeved cables, and they tend to be a tad on the stiff side as well.

Running, I found the unit to be relatively quiet, even testing outside of the case.

All said and done, Seasonic units are usually about as safe a bet as one can get, and this one checked out fine so far. I would definitely buy another at the price I paid, if needed.

Experience: 1 Months

Verified OwnerVerified Owner


- modular
- very solid and good quality build
Cons - price


After read review about brand for PSU. I decided go with Seasonic. As soon I saw this unit was on sale. I bought it rightaway ($65). Never regret. Installed it without having any issues. product is ROCK SOLID!! Really good.

Experience: 2 Days

Verified OwnerVerified Owner


Cons None


Note product photo here is outdated as the unit I received came with fully modular cables (M12II Evo model).

The unit has weight to it suggesting quality components inside I supposed. The build quality is excellent as I really enjoy installing it.

Experience: 2 Months

Verified OwnerVerified Owner


Modular, Silent, 120mm Fan
Cons None


Using this PSU in the Silverstone GD05B and have no problem.

Experience: 20 Days

Verified OwnerVerified Owner


- Great PSU, high quality build
- 5 year warranty
- Modularity
Cons - 4 pin power cable too short


Overall solid PSU. Just don't like the short 4 pin power cable, makes it impossible to run it behind the panel and now end up with a cable hanging next to the motherboard.

Even though it's Seasonic, I wouldn't pay full price for this PSU.

Freedom 42
Experience: 2 Months

Verified OwnerVerified Owner


quiet (almost silent), modular
Cons pricey if not on sale


got it for $30 after $20 MIR, used in an ATX 65 nm 65W TDP overclocked, single 16X, 4 DDR2, 3 HDD, 2 optical, fan not audible

Experience: 19 Days

Verified OwnerVerified Owner


As an 80 Plus Bronze unit, it delivers energy to your components efficiently with less of it lost as heat. This unit also has sleeved cables, which makes cable management much easier. Another thing is this unit is partially modular, so again cable management is a breeze. The unit performs quietly at idle and at load; I've yet to hear it despite it being less than 3 feet from me. In terms of aesthetics, its nice and simple without any fancy colours, and will fit in well in most cases.
Cons My only issue with this unit is that the cables seemed short, in particular I had a bit of trouble with the 24-pin connector. Although that may be more the fault of my humongous case and not the PSU itself.


I've always as heard that Seasonic was one of the top PSU makers but the price tag had always stopped me from buying them. After nabbing this baby on sale, I am convinced its worth the regular price tag. I've also realized that I can never go back to non-modular PSUs. Curse you Seasonic. Curse you!

Experience: 1 Weeks

Verified OwnerVerified Owner


it is a Seasonic
80+ bronze
Cons n/a


I have always trusted Seasonic being a quality name as the power supply unit, this one is no difference!

it's quiet, it's stable, it's efficient, and it's easy to use due to a modular design.

and i got it for an incredible price

Yuk Wan_L
Experience: 2 Weeks

Verified OwnerVerified Owner


Sturdy, Good pricing
Cons None


Been stable and good for the past 2 weeks. Might upgrade to higher walt later if required.

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Messages about Seasonic M12II-520 Bronze 520W EPS12V 20/24PIN ATX PFC 80+ Modular 6PIN PCI-E 120mm

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Forum messages are not reviewed and may not contain accurate information about a product. Message contents are opinions from customers based on their own experience with a product. We do not recommend you make puchasing decisions based on Forum messages.

Reviews from the Web

Below are reviews found on other web sites for this product submitted by customers.

Comment: Extensive review from JohnnyGuru gives this unit an impressive 9.7/10
Posted by: ShadyGregBrady @05/06/10
Submit a review link   |   Latest 30 reviews

Product Warranty

1 year limited warranty through

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