Dell Precision U3525 Quick Reference Manual page 12

For dual-monitor capable cards with 1 DVI and 1 VGA connector
Single DVI/Single VGA
DVI
Use the appropriate connector(s) when you want
to connect your computer to one or two monitors.
For dual-monitor capable cards with 2 DVI connectors
Dual DVI
DVI
DVI
Use the DVI connectors to connect
your computer to one or two DVI
monitors.
12
Quick Reference Guide
Dual VGA With VGA Adapter
VGA
Use the VGA adapter when you want to connect
your computer to two VGA monitors.
Dual DVI With One VGA Adapter
DVI
VGA
Use the VGA adapter to connect a
VGA monitor to one of the DVI
connector.s on your computer
VGA
VGA
Dual DVI With Two VGA Adapters
VGA
VGA
Use two VGA adapters to connect two
VGA monitors to the DVI connectors
on your computer.