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antlion ,

Considering the PoE switch is also powered by an adapter, I’d say no. Your have the same efficiency from the AC-DC conversion plus line losses.

DJArbz ,

Converting power once vs X times definitely has an efficiency factor.

JustEnoughDucks ,
@JustEnoughDucks@feddit.nl avatar

Really depends. If you have 1 device that uses 10W with 90% efficiency, you lose 1 W. If you have 10, 1W devices with 90% efficiency, you lose 1 watt.

It is less efficient if X device has lower efficiency or if you have DC/DC converters in series (which is likely with PoE), but likely it is negligable difference.

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