Southbridge NIC faster than seperate chip?

[MadAd]

How much faster would an NIC built into the northbridge (or southbridge) perform eg Nvidia chipset, compared to a discrete chip on the motherboard, say, a marvel??

 

[jjmIII]

might want to ask the network guys too....

 

[MadAd]

Ah yes thanks, willdo if no one knows here, it should really be a mobo question, but perhaps a little too technical for the average reader here.