HP ProLiant DL320 G5p Server - Manual (Page 12)

Component identification 12
SATA device numbers (optional hard drive cage configuration)
Rear panel components
For this server model, PCI expansion slots 1-3 and 6-7 are reserved.
Item Description
1 Power cord connector
2 Mouse connector
3 10/100/1000 NIC 2 connector
4 USB connectors (2)
5 Serial connector
6 PCI Express expansion slot 5, low profile, half-length
7 PCI Express expansion slot 4, (optional PCI-X), full-length