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2-12 AlphaServer GS80/160/320 User's Guide
2.3.4 Directory Module
In a GS160/320 system, one directory module is required for each QBB
in a system box. In a two-drawer GS80 system, a directory module is
required in each system drawer. No directory module is needed in a
one-drawer system. The directory module functions as a memory
coherency manager.
Figure 2–8 Directory Module
Directory
DIMMs
PK0606