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The M12 uses the same basic circuit as Seasonic's S12-500 and S12-600, as well
as the more recent Energy Plus models. The layout of the PCB is identical; so
it seems that the differences between Seasonic's new models are only skin deep.
At heart, they all use pretty much the same electronics.
The electronics are almost completely unchanged from other Seasonic models.
The heatsinks match the ones found in the newer Energy Plus line, and are smaller
and block less air than the heatsinks in the original S12's.
The heatsinks are the new ones found in Seasonic's Energy Plus series.
Airflow through the power supply is quite good. On the whole, components are
widely spaced, and the new heatsinks do not impede air too much. Airflow should
be much the same as any other power supply with a 120mm fan, especially at lower
loads when the 60mm fan on the back panel hasn't started. When it does come
on, the smaller fan serves as spot cooling for the main transformer and the
other electronics between the two main heatsinks. It will also prevent exhaust
heat from escaping back into the system an effect that can be quite substantial
at higher loads.
There is a gap between the back panel and the PCB to make room for the fan
and the cable sockets.
An secondary heatsink provides spot cooling for the diode bridge rectifier.
Seasonic's usual high quality parts.
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