Dell Precision Workstation 390 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
DVI
Use the DVI connectors to connect
your computer to one or two DVI
monitors.
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Quick Reference Guide
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 One VGA
Adapter
DVI
Use the VGA adapter to connect
a VGA monitor to one of the DVI
connectors on your computer
VGA
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