Every Mac with a Mini Display Port means that you can connect an external display or projector using an adapter. You can use an external display as your main workspace or to extend your desktop, or you can work in mirrored mode with a projector so you can view what your audience sees. The Apple Mini Display Port to dual-link DVI adapter works best with displays that operate at dual-link resolutions, which are resolutions above 1920 x 1200. For displays that do not support dual-link DVI resolutions (displays that operate at resolutions of 1920 x 1200 or lower) you should use the Apple Mini Display Port to DVI adapter.