Figure 1-9 Memory Subsystem
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 DIMM 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, and 4 Gb. Table 1-2 (page 27) lists each
supported DIMM size, the resulting total system capacity, and the memory component density.
Each DIMM is connected to two buffer chips on the cell board.
See Appendix C for more information on DIMM slot mapping and valid memory configurations.
Table 1-2 Server DIMMs
Memory Component DensityTotal CapacityDIMM Size
128 Mb32 Gb1 Gb
256 Mb64 Gb2 Gb
512 Mb128 Gb4 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.
Detailed Server Description 27
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