Eurocom Panther 3.0 - Manual (Page 265)

AMD Video Driver Controls
Display Devices & Options C - 7
C
Display Devices & Options
Note that you can use a DVI cable connected to the DVI-Out port, or an HDMI
(High-Definition Multimedia Interface) cable connected to the HDMI-Out port to
connect an external display. See your display device manual to see which formats
are supported.
Display Mode Description
Single One of the connected displays is used as the display device
Duplicate Both connected displays output the same view
Extend
Both connected displays are treated as separate devices, act as a
virtual desktop and may be configured independently
Table C - 1
Display Modes