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2: System Overview and Options
CPU Expansion Module
The CPU expansion module is a 2U AC-powered device that consists of the following:
•
Zero, one, or two Intel Itanium 2 processors (each with integrated L1, L2, and L3
caches)
•
Between 2 GB and 24 GB of local DIMM memory (4, 8, or 12 DIMMs)
•
One L1 controller that provides the following services:
–
Controls and sequences power
–
Controls and monitors the environment
–
Initiates a reset
–
Stores identification and configuration information
Figure 2-4 shows the front and rear views of a CPU expansion module.