Silicon Graphics Origin 3900, User Manual, Page: 90 / 292

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3: Cx-brick
Product Options
You can configure the Cx-brick to match your computational needs. Table 3-5 lists the
configurable components of the Cx-brick and the available options.
Important Notes
The following rules apply to the Cx-brick:
• The number of available XIO ports is equivalent to the number of IP53 node boards.
• The two DIMMs that compose a DIMM pair must be the same capacity; however,
each of the bank pairs can differ in memory capacity.
• The four processors contained on an IP53 node board must be the same speed;
however, the IP53 node boards within a Cx-brick can contain processors of varying
speeds.
• When the Cx-brick contains four 0-processor node boards, it is referred to as a
memory-only Cx-brick. This brick must have a direct connection via ports A and F
to another Cx-brick that contains at least four processors.
Table 3-5 Configurable Items of Cx-brick
Configurable Component Option
IP53 node board Number of boards per Cx-brick: 1, 2, 3, or 4
Number of processors per board: 0 or 4
Memory Number of DIMMs per IP53 node board: 2, 4, 6, or 8
Size of DIMMs: 512 MB or 1 GB