Dell Precision MD506 Quick Reference Manual page 12

For dual-monitor capable cards with one DVI connector and one VGA connector
One DVI connector and one VGA connector:
DVI
Use the appropriate connector(s) when you want to
connect your computer to one or two monitors.
For dual-monitor capable cards with two DVI connectors
Two DVI connectors:
DVI
Use the DVI connectors to
connect your computer to one or
two DVI monitors.
12
Quick Reference Guide
VGA
Two DVI connectors with one
VGA adapter:
DVI
DVI
Use the VGA adapter to connect a
VGA monitor to one of the
DVI connectors on your computer
Two VGA connectors with one VGA adapter:
VGA
Use the VGA adapter when you want to connect your
computer to two VGA monitors.
Two DVI connectors with two
VGA adapters:
VGA
Use two VGA adapters to connect two
VGA monitors to the DVI connectors
on your computer.
VGA
VGA
VGA