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1: Getting Started with the Silicon Graphics Prism
XG2N and Compute Modules
The most basic Silicon Graphics Prism uses two modules:
•
A graphics 2-processor and memory capable node module (called an XG2N
module).
•
A base compute module that provides base I/O as well as processors and memory.
The XG2N module is a 2U rack mountable enclosure which, in addition to the two
high-performance graphics pipes, adds to the host system a node board with two CPUs
and four, eight, or twelve memory DIMMs. This module connects as an integral part of
the system’s compute/memory fabric. Though it contains CPUs and memory, the XG2N
module does not have boot I/O functionality, and therefore may not be used as a
standalone system.
The rear panel of the XG2N module
with FireGL X2PRO-256
is shown in Figure 1-1 on
page 3. The rear panel of the XG2N module
with FireGL X3-256
is shown in Figure 1-3 on
page 4.
The XG2N module is a node-connected module, and therefore connects to the host
system using NUMAlink, either directly or through an optional NUMAlink module
(router). This way the XG2N module becomes an integral part of the system, and can
contain both CPUs and memory, in addition to graphics output capabilities. Note that
NUMAlink routers may be available only with specific system configurations. Check
with your SGI sales or service representative for information on available configurations.
Each XG2N module contains two graphics pipes, each capable of supporting two display
devices. In systems with only two pipes, the pipe and channel designations are defined
as in Figure 1-1 and Figure 1-3. In systems with more than one XG2N graphics module
the pipes are numbered as shown in Figure 1-2 and Figure 1-4.
