Product Detail 3 x 32 bit PCI Expansion Slot for 2U Rackmount Chassis 3-32 bit PCI Slot for 2U Rackmount Chassis;Supports the 4th, 5th & 6th PCI slot 2U 3*PCI-32bit/5V/33MHz single channel riser card; The gold fingers linked with the middle riser PCI-32 connector(main) is connected to the motherboard PCI-32 slot-6. The top and bottom PCI-32 riser connectors(share) linked with 2* 8-wires paddle link are connected to the PCI-32 slot-5 and slot-4; Use a 2-channel riser to support 2 independent buses of up to 3 slots PCI-32 expansion. . The "32 bit Riser Card with 3 Slots for 2U Rackmount chassis" is best product for you. We recommended 32 bit Riser Card with 3 Slots for 2U Rackmount chassis