HP Integrity rx7640 Installation Manual page 30

HP Integrity rx7640 Server and HP 9000 rp7440 Server Overview
Detailed Server Description
PDH Riser Board
The PDH riser board is a small card that plugs into the cell board at a right angle. The PDH riser interface
contains the following components:
• Microprocessor memory interface microcircuit
• Hardware including the processor dependant code (PDH) flash memory
• Manageability microcontroller with associated circuitry
The PDH obtains cell board configuration information from cell board signals and from the cell board local
power module (LPM).
Central Processor Units
The cell board can hold up to four CPU modules. Each CPU module can contain up to two CPU cores on a
single socket. Modules are populated in increments of one. On a cell board, the processor modules must be the
same family, type, and clock frequencies. Mixing of different processors on a cell board or partition is not
supported. Refer to Table 1-1 for the load order that must be maintained when adding processor modules to
the cell board. Refer to Figure 1-8 for the locations on the cell board for installing processor modules.
NOTE Unlike previous HP cell based systems, the HP Integrity rx7640 server cell board does not
require that a termination module be installed at the end of an unused FSB. System firmware
is allowed to disable an unused FSB in the CC. This enables both sockets of the unused bus to
remain unpopulated.
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Chapter 1