Silicon Graphics Origin 350 User Manual page 95

007-4566-001
The Origin 350 server system can be configured with or without a NUMAlink module.
When the system does not have a NUMAlink module, the system can contain from 2 to
8 processors. When the system does have a NUMAlink module, the system can contain
from 4 to 32 processors.
Note: For more information about these configurations, see "System Configurations" on
page 75.
The processors are housed in compute modules (see Figure 2-2) that can be configured
as one the following devices:
• Base compute module with base I/O functionality. All Origin 350 server systems
contain one base compute module that contains the following components:
– Two or four 64-bit MIPS RISC processors.
– 4 MB of secondary (L2) cache per processor.
– 1 GB to 8 GB of local memory.
– Four PCI/PCI-X slots.
Note: The lowermost PCI/PCI-X slot comes with a factory-installed IO9 PCI 66
MHz card. Consequently, the slot (third slot down), which is on the same bus as
the slot in which the IO9 PCI card is installed, can only support a PCI card that
runs at a speed of 66 MHz or slower. Therefore, the two uppermost slots can
support PCI/PCI-X cards, while the third one down can only support a PCI card.
– One IO9 PCI card that comes factory-installed in the lowermost PCI/PCI-X slot.
The IO9 card has a real time interrupt input port and output port, an Ethernet
port, and a SCSI connector. The IO9 card is also needed to support the module's
two SCSI disk drives, the DVD-ROM, a serial port, and a daughtercard with
three more serial ports and two PS/2 connectors for a keyboard and a mouse.
– One Bedrock ASIC (the crossbar between the processors, local memory, the
network interface, and the I/O interface).
• Expansion compute module (no base I/O functionality). For Origin 350 server
systems that contain more than one compute module, the additional modules are
expansion compute modules. The only difference between the base compute
module and the expansion compute module is that the expansion compute module
Functional Architecture
69