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I'm confused about the marketing on the new RPI 4. Here in the tech specs it says "Power over Ethernet (PoE) enabled (requires separate PoE HAT)". What does it mean it's enabled, but it needs a separate hat. The RPI 3 could be powered with POE using a hat, what makes this any different?

  • Only the 3B+ (and now the 4) has the 4 pin ethernet PoE centre tap connector required by the PoE hat. – Mark Booth Jun 27 at 21:47
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It means the hardware with a POE HAT will work without any special software changes needed. That means the support is built-in to Raspbian Buster (which was launched today with the RPi4).

  • So on the RPI 3, special software changes were needed in order to use the POE hat? – dave k Jun 25 at 5:39
  • That's because it was new hardware on the RPi3B+. On the 4B it's tried and tested hardware and firmware. @davek – Dougie Jun 25 at 21:30

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