What hardware exactly is supported in theory as well as tested working?
It looks like BE, BE2 and BE3 , XE100 Skyhawk are some of the chips supported but which cards does this map to exactly… are dual and quad port cards supported?
I don’t know. Why don’t you try them? 
I would refer you to the relevant FreeBSD manpage… but it seems that doesn’t have any real details either.
Yeah even the driver itself isn’t very specific… which is why I asked. I should have mentioned that I had already looked at the driver and manpage 
lol
I figure @kallisti5 could let us know which one he has working at least.