Dell OptiPlex 780 Service Manual page 8

Small form factor
NOTE: The PCI Express x16 slot is disabled when a display is connected to the
integrated video connector.
Drives
Externally accessible
5.25 inch drive bay(s)
Mini-tower
Desktop
Small form factor
3.5 inch drive bay
Mini-tower
Desktop
Small form factor
Internally accessible
3.5 inch drive bay(s)
Mini-tower
Desktop
Small form factor
NOTE: Your computer can support up to two 2.5 inch hard drives with brackets.
External Connectors
Audio
Back panel
Front panel
eSATA
Network
Parallel
Serial
USB
Front panel
Back panel
Video
System Board Connectors
PCI 2.3
Mini-tower
one low profile card
for SATA DVD-ROM, DVD+/-RW, or CD
+/-RW drives
two bays
one bay
one slimline bay
for 19-in-1 Media Card Readers
one bay
one bay
one slimline bay
for hard drives
two bays
one bay
one bay
two connectors for line-in/ microphone
and line-out
two front-panel connectors for
headphones and microphone
one 7-pin connector
one RJ45 connector
one 25-pin connector (bidirectional)
one 9-pin connector; 16550C-compatible
two connectors
six connectors
one 15-hole VGA connector
one 20-pin DisplayPort connector
data width (maximum) — 32 bits
two 120-pin connectors