2U riser with 2 PCIE x16 slots and 1 x PCI-X 64-bit slot Quantity in Basket:noneCode: 2xPCIE16+64bit Price:$79.00Shipping Weight: 1.00 pounds Quantity: This 2U riser comes with 2 x PCIE 16X slots and 1 x PCI-X 64-bit slot. Your MB(like Tyan S5211) must have 1 x PCIE 16X slot in position B! Also your MB must have another PCIE 16X slot in position C or D, and 1 x 64-bit slot in position E. Please see the picture below for reference!