Chapter 1
HP Integrity rx8640 and HP 9000 rp8440 Server Overview
Detailed Server Description
26
Valid Memory Configurations
The first cell must have one DIMM pair loaded in slots 0A/0B. The server can support as little as 2 GB of main
memory using two 1 GB DIMMs installed on one of the cell boards and as much as 512 GB by filling all 16
DIMM slots on all four cell boards with 8 GB DIMMs.
The following rules explain the memory configuration:
1. DIMMs must be loaded in pairs (same size within a pair).
2. DIMM pairs must be loaded in slot order (0A/0B, 1A/1B, 2A/2B, ...)
3. Largest DIMMs must be loaded first followed by progressively smaller DIMM module sizes.
A paired set of DIMMs is called a rank. DIMMs in a rank must be of the same capacity. See Table 1-3 on
page 27 and Figure 1-9 on page 27 for DIMM load order and layout on the cell board.
A quad is a grouping of four DIMMs (Figure 1-9). Configurations with 8 or 16 DIMM slots loaded are
recommended. Adding a rank enables a dedicated DDR-II bus on a cell to increase the amount of usable
memory bandwidth available. Available memory is proportional to the amount of memory installed.
Table 1-2 DIMM Sizes Supported
DIMM Size Total Capacity Memory Component Density
1 GB 64 GB 256 Mb
2 GB 128 GB 512 Mb
4 GB 256 GB 1024 Mb
8 GB 512 GB 2048 Mb
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