Pdh Riser Board; Central Processor Units; Cell Board Cpu Module Load Order - HP rp7440 Service Manual

Because of space limitations on the cell board, the PDH and microcontroller circuitry resides on
a riser board that plugs into the cell board at a right angle. The cell board also includes clock
circuits, test circuits, and de-coupling capacitors.

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
must be maintained when adding processor modules to the cell board. Refer to
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.
Table 1-1 Cell Board CPU Module Load Order
Number of
CPU Modules
Installed
1
2
3
4
Socket 2 Socket 3
Empty slot Empty slot
CPU installed Empty slot
CPU installed Empty slot
CPU installed CPU installed
Table 1-1 for the load order that
Socket 1 Socket 0
Empty slot CPU installed
Empty slot CPU installed
CPU installed CPU installed
CPU installed CPU installed
Detailed Server Description
Figure 1-8 for
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