Dell Precision ND218 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.
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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