The HDMI port supports audio output(Note: Mini DP on some iMac and MacBook series cannot support audio output)
Mini DP Port supports DP v1.2 (1.62 Gbps, 2.7 Gbps, 5.4 Gbps link rates)
HDMI Output supports the following resolutions:- 4K x 2K, - 1080p, - 720p, 480p, 576i, 480i,
DVI-D Output can reach 1.65Gbps per channel bandwidth and the following resolutions:- 1080p, - 720p, 480p, 576i, 480i,
VGA Output can support a maximum resolution of 1920x1200, and the following resolutions:1920x1080, 1650x1200, 1650x1050, 1400x1050, 1280x768, 1280x720, 1024x768, 800x600, 640x480
If two or more output ports are connected, only one output port can receive the input signalThe output priorities are:1. DVI-D Port2. HDMI Port3. VGA Port
