777281-001PCI riser cage assembly - Includes the metal cage assembly with the 3-slot standard primary PCI riser board - Includes one full-length PCIe3 x16 slot, one half-length PCIe3 x16 slot, and one half-length PCIe3 x8 slot
777282-001PCI riser cage assembly - Includes the metal cage assembly with the 2-slot primary optional PCI riser board - Includes one half-length PCIe3 x16 slot and one half-length PCIe3 x8 slot
777283-001PCI riser cage assembly - Includes the metal cage assembly with the 3-slot secondary optional PCI riser board - Includes one full-length PCIe3 x16 slot, one half-length PCIe3 x16 slot, and one half-length PCIe3 x8 slot
779086-0018-bay hot-plug small form factor (SFF) hard drive cage assembly - Includes the metal cage structure and the SAS backplane board - Mounts in the front of the server (three cage assemblies can be used)