Mini DisplayPort has the exact same number of wires as DisplayPort, and is capable of supporting everything that DisplayPort can. As far as anyone outside of Apple knows, audio is not supplied over the Mini DisplayPort connection.Unfortunately I don't think the miniDP supplies audio (full DP can, but it is not mandatory I don't think). I think I have read reviews of the 24" LED Display that indicate that audio is being fed through USB and not miniDP. Of course, that could just be the implementation in the display, or it may be the lack of audio in miniDP. We shall see I guess.