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Rpi 3b has proper gigabit Ethernet though.

Edit: 3B+. My bad.

"faster (300 mbps) Ethernet"[1]

It's basically a 1 Gbps PHY connected to 480 Mbps USB 2.0, so it's 240 Mbps Ethernet.

It doesn't.

Edit: It doesn't.

The 3B+ does though, IIRC (w/ PoE support too)

It doesn't. The ethernet is connected to a USB 2.0 bus. Yes the link trains at 1 gbps, but it's limited by the slow bus.