Dell Precision 530 Guide De Configuration Et De Référence Rapide page 17

Dual Monitors
Attach the main monitor to the primary port. See "Frequently Asked
Questions" on page 18 for more information.
secondary port
NOTE: A second monitor is optional and requires a multimonitor graphics
adapter card.
NOTE: To enable dual-monitor support, both monitors must be attached when
the computer starts.
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primary port
Setup and Quick Reference Guide
17