I just ordered a Mac Pro MD770LL/A. Is there a DVI-D cable included? I have a Sony monitor with a DVI-D input so I assume I would need a DVI-D to DVI-D cable. Is this correct? Thanks.
The assumption is that the required cable is shipped with your display. Many displays have traditionally used a captive cable that is not removeable.
If your display is wider than 1920 wide, you will need a "Dual-Link" DVI cable. Dual-link means that the data lines are doubled to support wider displays -- it has nothing to do with Dual Displays.