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Seasonic M12 II Bronze Evo Edition 850W PSU Review


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The Seasonic M12 II Bronze Evo Edition 850W power supply is using the ADDA AD1212UB-A70GL 120mm 7 blade ball bearing fan. This 120mm fan is rated at a current of 0.50A and a power output of 6W. The fan can spin up to 2,500 rpm generating 98.6 CFM of air flow while emitting 43.3 dBa noise.

We are quite sure it won’t reach these speeds even under load, but we will find out shortly.
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The Seasonic design is very well laid out with several row of heatsinks running along the length of the PCB. This is to ensure excess heat can be radiated and expelled through the vents.
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The vertical modular board contains a resonant controller. FETS here will regulate the +12V rail. Soldering quality is very high throughout.
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The main PCB exhibits no concerns, soldering quality is excellent.
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Seasonic have populated the board with very high grade Japanese capacitors including some from Nippon Chemi Con and Rubycon. All secondary stage capacitors are rated to 105c. There are some Nippon Chemi Con polymer capacitors present, used to filter the DC outputs.
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Primary stage capacitors are high grade Japanese Nippon Chemi Con branded – 400V, 330uF, rated at 105C.


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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.