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The the top vented panel came off with the removal of four screws. Compared
to the X-650, th heatsinks are larger... but puny compared to the massive aluminum
extrusions used in fanless 400W power supplies that we've examined in the past.
As usual, the interior is extremely tidy and meticulously laid out.
The metal plate on the patent-pending DC/DC Connector Module (12VDC
to 5VDC and 3.3VDC) is the only extra heatsink the X-400 has gained compared
to the X-650. Every other heatsink in the X-400 is matched by one in the X-650.
Seasonic's explanation of the DC/DC Connector Module in the X-series
design is worth repeating. By making the conversion from 12VDC to 5VDC and 3.3VDC
on this module, the losses inherent in low voltage electricity transfer are
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