Dell Precision 390 - Manual (Page 24)

24
Quick Reference Guide
Back View (Desktop Orientation)
3 2
4
1
1 card slots Access connectors for any installed PCI or PCI Express cards.
2 power connector Insert the power cable into this connector.
3 voltage selection switch See the safety instructions located in the Product Information Guide for more
information.
4 back-panel connectors Plug serial, USB, and other devices into the appropriate connector.