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
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
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
Supermicro PERIPHERAL, RSC-R2UW-2E8E16 Supermicro RSC-R2UW-2E8E16 - Supermicro RSC-R2UW-2E8E16 $140.92 $78.29
Supermicro PERIPHERAL, RSC-W2-66 LHS, Passive, Output: (2) PCI-E x16 Signal: (2) PCI-E x16 $120.47 $66.93