This is the system board (motherboard) for the HP Z420 Workstation, designed to support Intel Xeon CPUs on the LGA2011 socket and DDR3 ECC memory across 8 DIMM slots.
Systems Maintenance Techs
Mid-Lifecycle Capacity Expansion
"The 708615-001 is the primary choice for Systems Maintenance Techs performing critical Mid-Lifecycle Capacity Expansion tasks. It meets all OEM performance specifications for HP systems."