Supermicro PERIPHERAL, RSC-R1UU-UE16 Riser Card Standard 1U LHS Passive UIO to 1 x UIO (PCI-E x8), 1 x PCI-E x16. $86.45 $48.03
Supermicro PERIPHERAL, RSC-R1UU-E8PR Motherboard Slot Type - UIO Slot (X8DTU/-F, X7DWU, X7DCU); Riser Card Output Slot(s) - 1 PCI-E x8. $43.54 $24.19
RSC-R1UW-E8R - Supermicro PERIPHERAL, 1U RHS WIO RISER CARD WITH ONE PCI-E X8 SLOT Riser Card 1U RHS Passive WIO to 1 x PCI-E x8. $73.19 $40.66