HP Z220 SFF, Z220 CMT, Z420, Z620, and Z820 Workstations Maintenance and Service Guide

HP Z420 Workstation system board architecture
NOTE: The PCIe designators indicate the mechanical connector size and number of electrical PCIe
lanes routed to an expansion slot. For example, x16(8) means that the expansion slot is mechanically
a x16 length connector, with 8 PCIe lanes supported.
20 Chapter 1 Hardware overview