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HP Integrity rx8640, HP 9000 rp8440 Server User Service Guide

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Figure 7 Memory Subsystem
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DIMMs
The memory DIMMs used by the server are custom designed by HP. Each DIMM contains DDR-II
SDRAM memory that operates at 533 MT/s. Industry standard modules do not support the high
availability and shared memory features of the server. Therefore, industry standard DIMM modules
are not supported.
The server supports DIMMs with densities of 1, 2, 4, and 8 GB. Table 2 lists each supported DIMM
size, the resulting total server capacity, and the memory component density. Each DIMM is
connected to two buffer chips on the cell board.
Table 2 DIMM Sizes Supported
Memory Component DensityTotal CapacityDIMM Size
256 Mb64 GB1 GB
512 Mb128 GB2 GB
1024 Mb256 GB4 GB
2048 Mb512 GB8 GB
Cells and nPartitions
An nPartition comprises one or more cells working as a single system. Any I/O chassis that is
attached to a cell belonging to an nPartition is also assigned to the nPartition. Each I/O chassis
has PCI card slots, I/O cards, attached devices, and a core I/O card assigned to the I/O chassis.
On the server, each nPartition has its own dedicated portion of the server hardware which can
run a single instance of the operating system. Each nPartition can boot, reboot, and operate
independently of any other nPartitions and hardware within the same server complex.
Detailed Server Description 17