HP A2051-69108 - 96MHz system processor board - 96MHz System Processor Board - Plugs into Slot to the Right of the Multifunction I/O Board Retail
HP D5028-69007 - System processor board mounted on tray - Has four processor board slots and eight PCI slots Retail
HP 5062-6954 - System processor board - For use with HP Vectra 486 series - System Processor Board - Plugs into System Interface Board Retail