Seasonic X-400 Fanless PSU

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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.

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The X-400 heatsinks have wide spaced fins, and they are bigger than those in the X-650, but not that much bigger...
(Click on image for larger image in new window) you can see in this photo from our X-650 review.

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Another view of the X-400 Fanless.
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This photo helps to clarify some of the changes in the X-400 Fanless...

...compared to a photo of the X-650 from a similar angle.

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 minimized.

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