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Type HDA 7.1 channel
Expansion Bus
Bus type PCI Express x1 and x16
PCI 32-bit
PCI (SLOT3, SLOT5, SLOT6)
Connector three
Connector size 124 pins
Connector data width
(maximum)
32 bits
Bus speed 33 MHz
PCI Express (SLOT1) NOTE: If a graphics card is installed in
each of the PCI Express x16 card slots
in the dual-graphics configuration, the
PCI Express x1 card slot is not
accessible for use.
Connector one x1
Connector size 36 pins
Connector data width
(maximum)
1 PCI Express lane
Bus throughput x1 slot bidirectional speed — 2.5 Gbps
PCI Express (SLOT7)
Connector one x16
Connector size 164 pins
Connector data width
(maximum)
8 PCI Express lanes
Bus throughput x16 slot bidirectional speed — 20 Gbps
PCI Express (SLOT2, SLOT4)
Connector two x16
Connector size 164 pins
Connector data width
(maximum)
16 PCI Express lanes
Bus throughput x16 slot bidirectional speed — 40 Gbps
Drives
Available devices Serial ATA drive, floppy drive,
memory devices, Blu-ray™ Disc
drive, DVD drive, DVD-RW drive,
CD-RW/DVD combo drive, and
media card reader
Externally accessible: two 3.5-inch drive bays
four 5.25-inch drive bays
Internally accessible: four 3.5-inch drive bays for hard drives
Connectors
External connectors:
IEEE 1394 front and back-panel 6-pin serial
connectors
Network adapter RJ45 connector
PS/2 (keyboard and mouse) two 6-pin mini-DIN
USB two front-panel, six back-panel, and
two internal USB 2.0–compliant
connectors
System board connectors:
IDE drive one 40-pin connector
Serial ATA six 7-pin connectors
Floppy drive 34-pin connector
Fan three 5-pin connectors
Liquid cooling (optional) one 12-pin connector
PCI three 124-pin connectors
PCI Express x1 36-pin connector
PCI Express x16 (SLOT7); card
length up to 17.8 cm (7 inches
only)
164-pin connector
PCI Express x16 three 164-pin connectors
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Documentation
6.07.2007
http://support.euro.dell.com/support/edocs/systems/720H2C/en/OM/appendix.htm