Install half heightlow profile x1 pci express interface cards in a standard pci expansion slot the pci1pex1 pci to pci express adapter card lets you use low profile pcie expansion cards in a serverdesktop motherboard pci slot the adapter connects through a 32 bit pci slot to provide a low profile pcie x1 slot in its place a spare full size bracket is included for installation in larger desktop or server expansion slots that can accommodate a full sized card the pci to pci express adapt