Conclusion:
Seasonic has left me impressed yet again with their M12II power supply. The S12II we reviewed a couple months ago set a very good first impression for this company as well as a high bar for quality. The M12II we reviewed today was able to show us that they aren't slowing down and it's taken that bar and raised it even a little more. Seasonic has shown us that they can make high performing power supplies with the S12II and now the M12II. Amongst taking the time to do this they still haven't lost their attention to quality because both supplies show you the manufacturing quality right from the minute you first see them in the box. I was impressed with the results of testing the M12II; it's proven to have very solid voltages and was able to maintain practically silent operation at the same time. Packing all that together with a modular cable design, this is one excellent power supply that is sure to satisfy the needs of anyone looking for quality - be it gamers, overclockers or home users.

Pros:
Solid performance results
Modular design
Three year warranty
80Plus rating
Ultra-silent operation
Enhanced +12V rail system compared to the S12II (Better for gamers with high end video cards)

Cons:
Lacks the solid state capacitors the S12II has