505836-001Trusted Platform Module (TPM) 1.2 board - Plugs in socket on the system I/O board - NOTE: this board is not customer replaceable - It is attached to system board with a security rivet
662528-001Power supply backplane board assembly - Vertical board on the front of the power supply bays - Interconnects the power supplies to the system I/O board
777279-001SAS/SATA backplane board - Mounts on the rear of the 8-bay small form factor (SFF) hard drive cage - Performance is up to 12Gbs transfer speed
777280-001SAS/SATA backplane board - Mounts on the rear of the 2-bay small form factor (SFF) hard drive cage - Performance is up to 12Gbs transfer speed
812910-001Processor/memory mezzanine board (tray) - Includes two additional processor slots and twenty-four DIMM slots - Mounts on top of the system I/O board above the integrated processor and DIMM slots