Well it came, the chipset is realtek. It has filled all the slots in my 7200. With a G3,ATi and the gigabit it looks like it will explode The preformance is good in OS 9, and file transfers are 3333x faster.
There is no gigabit for nubus, however there is a RARE 10/100 card that is as rare as the Sonnet G4 for nubus and other rare cards. It makes the 10baseT seem like dial up.
I think I have one 10/100 NuBus card. They are pretty rare. It mostly helps with file sharing inside your network. The Internet won't be any faster unless you happen to have a connection faster than 10 Mbps.
The preformance is good in OS 9, and file transfers are 3333x faster.