[rasz]

You should be fine with RPi3B+ internal gigabit NIC

https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=2085...

pi@raspberrypi:~ $ sudo iperf3 -c XXX.XXX.X.XXX

[ 4] 0.00-1.00 sec 37.9 MBytes 318 Mbits/sec 0 257 KBytes