No because bandwidth is always lost in anything you buy that requires communicating between two things especially..
You get a 3mbit connection for example in cable, and chances are you won't actually get a solid 375kb/sec kind of deal, although some of it depends on the server you are downloading from and whether or not they can send you that bandwidth.
EDIT: Oh yeah and generally thats why they say 'UP TO' a maximum of 3.2gb/sec