2U riser with one PCI Express X16 and two X8 slots Quantity in Basket:noneCode: 2U-ExpX16X8X8 Price:$89.00Shipping Weight: 1.00 pounds Quantity: Rear side(Ribbon length varies) This 2U riser comes with 1 x PCIE 16X slot and 2 x PCIE 8X slots. Your MB must have 1 x PCIE 16X slot in position B! Also your MB must have 2 x PCIE 8X slots in position C or D. A MB example is Supermicro MBD-X8STE-O Please see the picture below for reference!