PCI-E PCI Express 8x 90 Degree Adapter Riser Card For 1U Computer Server PC Converter Expansion Card Components The PCI-Express 8X Riser Card makes the PCI-Express Card away from motherboard, with the PCI-Express socket directly in line with the socket on the motherboard. It is the right angle riser for the PCI Express X8 buses. The connector is soldered on the component side (B side) of the board. When an I/O board is inserted, the component side of the I/O board will face down, towards the motherboard.