G4/400 AGP vs. G4/400 Gigabit Ethernet-what's the difference?

[J.A.B.]

Newbie here buying a used machine.  It looks like it
will be one of the above. Can somebody outline the
differences between these 2 machines for me.  Best I
can tell, the Gigabit Ethernet has an ADC video
connector.  Any other differences?

Thanks,
Jeff

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