HP DL120 - Manual (Page 54)

Removal and replacement procedures 54
Expansion board
System board PCI expansion slots
There are two PCI Express expansion slots on the system board.
Item Slot code Slot type Interconnect Function
1 Expansion_slot_2 PCI Express x8 x4 Supports a low-profile riser board
2 Expansion_slot_1 PCI Express x8 x8 Supports a full-length/full-height riser board
NOTE: The Expansion_slot_2 can support PCI Express x8 expansion boards but at x4 speed.