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GS160/320 System Configuration Rules 3-15
Memory Configuration Guidelines
• On a memory module, DIMMs are divided into two groups of four called
arrays.
• A memory module must be populated on an array-by-array basis; that is,
groups of four DIMMs must be installed.
• DIMMs in an array must be the same size and type.
• DIMM sizes include 256 Mbyte, 512 Mbyte, and 1 Gbyte.
There are two types of DIMMs: single density (SD) and double density (DD).
• Density does not affect interleaving.
• One directory module DIMM is required for each memory array in systems
with more than one QBB.
• The type and number of DIMMs installed in the directory module is based
on the number of memory arrays populated and the physical size of the
memory arrays. See the table below.
• A larger DIMM type may always be used in place of the minimum required
DIMM type.
Directory DIMM Type Memory Array Size Part Number
0 256 MB 54-25019-AA
1 1 GB 54-25023-AA
2 2 GB 54-25023-BA
3 2 GB 54-25023-CA
4 4 GB 54-25023-DA