A modem that plugs into an expansion slot within the computer. Unlike an external modem, an internal modem does not provide a series of display lights that inform the user of the changing modem states ...
Like you say, negligible difference in performance, any comunications between your PC and Modem will be at a speed many times faster than your dsl connection.
Despite my unwavering position that (pro) laptops ought to have (optional) internal modems for some more years, I'm now beginning to ... look for an external modem.<BR><BR>I'm really getting to many ...