Dell OptiPlex 755 - Manual (Page 176)

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