HP D8540-69001 - Processor baseboard - Processor Baseboard - Mounts Horizontally in the Front Half of the Chassis Retail
HP D7054-69004 - Processor carrier board - Has four processor slots - Processor Carrier Board - Has Four Processor Slots - Two Boards are Used - Mounts to Processor Baseboard Retail
HP D7054-69007 - Cache coherency filter - One needed for each processor carrier board - Cache Coherency Filter - One needed for each Processor Carrier Board - Mounts to Processor Baseboard Retail