It means...you are reading the specs for onboard NIC, which is typically 1GB transfer rate (max) these days.
I have no idea if actual transfer rate ever approaches that...I've never checked it since...it is what it is, with great dependency on the connection type, IMO.
All those names you threw around...refer to chipsets, etc...which is not necessarily important. The important thing is to see that the proper drivers are installed. Since it's onboard, the drivers will either come from the system manufacturer or from the motherboard manufacturer (if self-built/custom. As long as the correct drivers are installed...I see no reason to worry about what chipset is ueed, etc. on a NIC of any sort.