User`s guide

System Components
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System Components
This section briefly describes the standard and optional modules of a Silicon Graphics
Prism, in the following subsections:
• “Base Compute Module” on page 33
• “XG2N Graphics Module” on page 35
• “CPU Expansion Module” on page 36
• “CMPX Module” on page 38
• “Router Module” on page 40
Base Compute Module
The base compute module is a 2U AC-powered device that consists of the following:
• 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 to four PCI/PCI-X cards
Note: At least one base compute module comes factory-installed with a base I/O
card in the bottom PCI/PCI-X slot and a four-port USB card in the upper slot. This
base I/O card is typically an IO10 card, but may optionally be an IO9 card (described
in “Optional IO9 PCI Card” on page 53).
• One or two sled-mounted serial ATA disk drives (at least one disk drive is required
in the system). The serial ATA disk drive(s) and the DVD-ROM require an IO10
card.
•DVD-ROM
Each base compute module also contains an L1 controller that provides the following:
• Controls and sequences power
• Controls and monitors the environment
• Initiates a reset
• Stores identification and configuration information