Dell OptiPlex 755 - Manual (Page 134)

Expansion Bus
Bus type PCI 2.3
PCI Express 1.0A
SATA 1.0A and 2.0
USB 2.0
Bus speed PCI: 133 MB/s
PCI Express x16: 8 GB/s bidirectional speed
PCI Express x1: 5 Gbps
SATA: 1.5 Gbps and 3.0 Gbps
USB: 480 Mbps
Cards: full-height cards supported
PCI:
connectors two
connector size two 164 pin connectors
connector data width
(maximum)
32 bits
PCI Express:
connectors one x1 and one x16
power 10 W (x1) and 75 W (x16) maximum
connector size 36 pins (x1) and 164 pins (x16)
connector data width (maximum) one PCI Express lane (x1) and 16 PCI Express lanes
(x16)
Drives
Internally accessible l Two SATA (Serial ATA) hard drives
l One3.5-inch floppy drive or media reader
l Two SATA optical drives
Externally accessible One eSATA drive (optional)
Connectors
External connectors:
Serial 9-pin connector; 16550C-compatible
Parallel 25-pin connector (bidirectional)
Video 15-pin VGA connector
Network adapter RJ45 connector
Optional PS/2 with secondary
serial port adapter two 6-pin mini-DINs
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:
SATA four 7-pin connectors
eSATA one 7-pin connector
Floppy drive 34-pin connector
Serial 12-pin connector for optional second PS/2 serial port
card
Fan 5-pin connector
PCI 2.2 three 120 -pin connectors
PCI Express one 120-pin (x16) connector
Front panel 40-pin connector
Key Combinations
In Microsoft® Windows® XP, brings up the Windows
Security window. If in MS-DOS® mode, restarts
(reboots) the computer.
or starts embedded system setup (during start-up only)
automatically starts the computer from the network
environment specified by the remote boot
environment (PXE) rather than from one of the
devices in the system setup Boot Sequence option