Dell 720H2C appendix Connectors, Controls and Lights

	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	164-pin connector
17.8 cm (7 inches only)
PCI Express x16	three 164-pin connectors
Controls and Lights
Power control	push button
Power light	green light — Blinking green in sleep state; solid
	green for power-on state.