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SeaSonic M12II 750 SS-750AM2 750W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Full-modular Power Supply New 4th Gen CPU Certified Haswell Ready

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Marketplace Seller
  • ATX12V / EPS12V
  • Full Modular
  • 80 PLUS BRONZE Certified
  • 100 - 240 V
  • +3.3V@25A, +5V@25A, +12V@62A, -12V@0.5A, +5VSB@3A

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews

SeaSonic M12II 750W Full-Modular Power Supply

Seasonic M12II Bronze Series has been the ever-popular power supply series of the Full Modular category. Now Seasonic extends the Full-Modular series by introducing M12II Bronze 650/750/850 to provide consumers a larger selection in the entry level 80PLUS Bronze certified category.

The M12II Bronze new models have built in a full protection feature including OCP, OPP, OTP, OVP, SCP & UVP and meet worldwide safety and environmental standards. The all-new M12II-650/750/850 units are the new leaders in the 80 PLUS Bronze category and another great addition to the Seasonic Retail power supply family.

SeaSonic M12II

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.


SeaSonic M12II
  • DC to DC Converter Design
  • High Reliable 105? Japanese Brand Capacitors
  • Ample +12V Outputs
  • Active Power Factor Correction (99% PF Typical)
  • Smart & Silent Fan Control (S2FC)
  • 12cm Ball Bearing Cooling Fan
  • Soft-Mount Rubber Cushions
  • Multi-GPU Technologies Supported
  • Full Modular
  • Easy Swap Connectors
  • Universal Ventilation (Hexagonal Structure)
  • 5 Year Warranty

Product Information

1. Dimensions (L x W x H): 6.2 x 5.9 x 3.3 in. (160 x 150 x 86mm)

2. AC Input & DC Output Voltages (Full Range: 100 ~ 240V (Max 90 ~ 264V)

Model +3.3V +5V +12V -12V +5Vsb Total Power
M12II 750 Bronze 25A 25A 70A 0.5A 3A 750W
150W 744W 6W 15W

3. Wire Configuration

Cable SeaSonic M12II
20 / 24-Pin Main Power
SeaSonic M12II
EPS12V / ATX12V (8-Pin / 4-Pin)
SeaSonic M12II
EPS 12V (8-Pin)
SeaSonic M12II
PCI-E (6-Pin / 8-Pin)
SeaSonic M12II
SeaSonic M12II
Peripheral (4-Pin)
SeaSonic M12II
FDD (4-Pin)
M12II 750 Bronze 1 1 1 4 8 5 2

What's in the box

SeaSonic M12II

Learn more about the SeaSonic USA SS-750AM

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: more than 1 year
Verified Owner
5/ 5
Great PSU 7/19/2020 11:57:36 AM

Pros: Reliable, no faults for 6 years

Cons: Did eventually die, out of warranty (6 years)

Overall Review: I'd heartily recommend Seasonic products

Did you find this review helpful?
Ownership: more than 1 year
Verified Owner
5/ 5
Still kicking 5/17/2020 11:14:47 AM

Pros: Very quite efficient replaced a dead 620 watt Seasonic which I loved but died due to a brownout

Cons: None

Overall Review: Highly recommended

Did you find this review helpful?
Ownership: more than 1 year
Verified Owner
5/ 5
Solid. Modular, going strong 4 year's later! 11/24/2018 10:17:06 AM

Pros: Everything.

Cons: None.

Overall Review: Get it!

Did you find this review helpful?
Ownership: more than 1 year
Verified Owner
5/ 5
4 yrs no issues 3/16/2018 8:11:34 AM

Pros: Seasonic scream quality. I've had this PSU for over 4 years now running an 3570K overclocked with a 7950 and now a GTX1070 in my little brothers machine and it's still pumping out steady juice. One of three seasonics I've purchased and they are all still running. I also love how they always come with a bag/pouch and they include extras cables for upgrading later. Seasonic knows what they are doing. They will always have a customer in me.

Cons: None so far

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Performs great 10/25/2016 10:54:34 AM

Pros: Excellent for new Z170 motherboards. I installed this on my Corsair 750D case and it fits very good for a big case and its modular. It performs good and the fan is extremely quiet.

(10/25/16): Thank you Seasonic for an excellent customer service.

Cons: - After almost 7 months of purchase, my HTPC began to randomly shutdown or reboot, starting to show that the ASUS motherboard activated the power surge protection. I found out that the 12V rail of the PSU was giving between 13.6V - 14.3V, and when the computer goes through stress it shutdowns. Im currently doing the RMA procedures to send it.....

UPDATE (10/25/16):

It was the motherboard and not the PSU!! When I got the PSU back from RMA, the ASUS motherboard readings were at 20V-22V and still activating the anti-surge protection. Definitely something else was off. Took a voltmeter and measured the 12V side of the sata, atx and PCIe power cables. Everything was giving flat 12.00V. The ASUS Z170A motherboard gives you the option to turn off the anti-surge protection. I turned it off, and everything was working fine.

Lesson learned: As a good practice, always have a voltmeter to diagnose PSU problems and never trust fully monitor readings from a motherboard.

2 out of 2 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
4/ 5
Nice product but lacks longevity 9/23/2016 5:50:01 PM

Pros: All around a decent product.

Cons: After about 6 months the unit rattled under stress. Attempting an RMA.

Did you find this review helpful?
Manufacturer Response:

Thank you for your comment and sorry to hear your story. We always try our best to deliver the best product. Unfortunately, it can happen that one fail. We are really sorry for this. If not yet done, kindly apply for RMA here: We will double check your request and take care of your RMA asap.

Thank you.

Best Regards,
Seasonic Team
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Seasonic quality 4/8/2016 2:31:09 PM

Pros: Just enough power to run my daughters desktop and no brown outs or shorts. Will buy Seasonic for PSU needs from here on out.

Cons: None

1 out of 1 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Nice and powerful. 3/10/2016 2:51:44 AM

Pros: - Its got enough headroom to run sli and corssfire configs with some OC going on.

Cons: - The power connectors look a little squished together.

Overall Review: I had the fans being really loud as a con before, but it's not the fan or the psu. It was my case being really low to the ground. The 200r's risers are minimal to say the least and allowed no air flow making the psu over extend its fan speed. I put some risers under my pc and boom, quiet as a fiddle.

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