Dell OptiPlex 390 Owner's Manual page 83

Cards
Small Form Factor
PCI-Express x16
Mini-Tower
Desktop
Small Form Factor
Drives
Externally Accessible (5.25–inch drive bays)
Internally Accessible:
3.5–inch SATA drive bays
External Connectors
Audio:
Back Panel
Front Panel
Network Adapter
USB 2.0
Mini-Tower
Desktop
Small Form Factor
Mini-Tower
Desktop
Small Form Factor
Mini-Tower/Desktop
Small Form Factor
up to one low-profile cards
up to one full-height cards
up to one low-profile cards
up to one low-profile cards
two
one
one slim optical drive bay
two
one
one
three connectors once each for
line-out, line-in, and microphone
two connectors for line-out and
line-in/microphone
two connectors for microphone
and headphone
one RJ45 connector
Front Panel: 2
83