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Seasonic M12 II Bronze Evo Edition 850W PSU Review

Rating: 9.0.

Seasonic are launching a new range of power supplies in the coming weeks and today we look at the 850W model in the Evo Edition series. The M12 II Bronze Evo Edition 850W is a full modular design achieving 80 Plus Bronze certification. 

Seasonic are releasing only two models in this series (750W and 850W) with stock due to land in the United Kingdom very soon. Seasonic are not compromising in regards to component selection, the design is a double forward converter implementation. They are also incorporating high grade Japanese components inside and we will take a closer look at this later in the review.
The Seasonic M12II Bronze Evo Edition is an updated version of past models and has full support for the latest Intel Haswell Z87 platform.

We recently published a little article on these compatibility concerns over here, with a short excerpt below:

“Intel’s Haswell C6/C7 power states require a minimum load of 0.05A on the 12V2 rail and many current power supplies will fail to provide that low a current. Many older power supply designs comply with ATX 12V V2.3 design guidelines meaning they only call for load of 0.5A on the CPU power rail. This will mean C6 and C7 power states will be disabled in the bios.

There may be cases that the supplies will become unstable when the processors try to enter into these states. Additionally the problems get worse when we factor in that many power supply units do not report minimum currents supported by the 12V2 rail.

The problem may kick in when the CPU enters sleep mode but with a load on the power supply non primary +3.3V and +5V rails. If the load on these rails hits a certain point (different from PSU to PSU) the +12V can go out of spec – voltages greater than 12.6V. If the +12V is out of spec when the system steps out of sleep state the power supply protection may kick in and stop the power supply from running normally. This situation may involve the end user turning the power supply switch off and back on again.

A power supply that uses a DC to DC design for the non primary +3.3V and +5V rails will not have a problem with the new low power sleep states. The reason is based around the DC to DC converter, used to convert +12V to +3.3V and +5V. This design ensures that there will always be load on the +12V regards of the load the CPU places on the power supply.”

Special features:

  • 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
  • Detachable Modular Cables
  • Easy Swap Connectors
  • Universal Ventilation [Honeycomb Structure]
  • 5 Year Warranty

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  • John

    Expensive, but as always A1+ quality. What a great company, love my X series.

  • Topperfalkon

    Great, ill wait on 750W as it will hopefully be £20 less. has everything we need!

  • TTTT

    They make for so many companies now, Cooler Master, Corsair, XFX, the list goes on and on! Still i always go for the company themselves, even though they cost normally a bit more.

  • Pingback: Seasonic M12II-850 Bronze EVO Review - Elite Gaming Computers()

  • zzz

    i got 750w version, is that as good as this one?

  • King-Juventino

    My S12 II 850W EVO unit is very load, even with load at 280 – 300W to PSU, fan ramps ups very quickly and it’s pretty loud.

    My PC with 3770K @ 4.5GHz and GTX 780 @ 1150/1600MHz pulls ~ 440W from the wall in Crysis 3 (measured with watt meter), that’s ~ 370W from PSU and fan hits very high rpm, I would say max.

    It’s very annoying and I would recommend anyone to look elsewhere if thy want a silent PSU, this one is a jet.

    I really don’t know how your unit (kitguru) and also one on jhonnyguru review was so silent, because there are many issues on the internet with people complaining about noise on S12 II units.

    Other than that it’s a very good PSU, it’s a shame that a bad fan / fan profile combo ruined such a great picture.

  • King-Juventino

    Yes it is.

  • Jirka Kolář

    I have only 520W EVO but I hope it’s at least good with only i5 4590 and 650ti boost.