Dell OptiPlex 755 User Manual page 176

Expansion Bus
Bus type
Bus speed
Cards:
PCI:
connector
connector size
connector data width (maximum)
PCI Express:
connector
power
connector size
connector data width (maximum)
Drives
Externally accessible
Internally accessible
Connectors
External connectors:
Serial
Parallel
Optional PS/2 with secondary serial port
adapter
Video
Network adapter
USB
Audio
System board connectors:
internal USB
SATA
eSATA
Floppy drive
Serial
Fan
PCI 2.3
PCI Express
Front panel
Key Combinations
<Ctrl><Alt><Del>
<F2> or <Ctrl><Alt><Enter>
supporting one device each
PCI 2.3
PCI Express 1.0A
SATA 1.0A and 2.0
USB 2.0
PCI: 133 MBs
PCI Express x16: 8 GB/s bidirectional speed
SATA: 1.5 Gbps and 3.0 Gbps
USB: 480 Mbps
low-profile cards supported
one
120 pins
32 bits
one x16
25 W (maximum)
164 pins (x16)
16 PCI Express lanes (x16)
one bay for a slimline floppy drive;
one bay for a slimline optical drive
one bay for a 1-inch-high hard drive
9-pin connector; 16550C-compatible
25-pin connector (bidirectional)
two 6-pin mini-DINs
NOTE: This option uses the PCI slot.
15-pin VGA connector
RJ45 connector
two front-panel and six back panel USB 2.0–compliant
connectors
two connectors for line-in/ microphone and line-out;
two front-panel connectors for headphones and
microphone
10-pin header for optional media card reader (in 3.5-
inch drive bay)
two 7-pin connectors
one 7-pin connector
34-pin connector
12-pin connector for optional secondary serial port
card
two 5-pin connectors
one 120-pin connector
one 164-pin (x16) connector
40-pin connector
If you are running Microsoft® Windows® XP, brings
up the Windows Security window; in MS-DOS® mode,
restarts (reboots) the computer
starts embedded system setup (during system start-
up only)