Installing Or Removing A Memory Dimm - Silicon Graphics Prism Hardware User's Manual

Installing or Removing a Memory DIMM

007-4772-002
The Silicon Graphics Prism Deskside visualization system is configured with a minimum
of 2-GB of on-board system memory and a maximum of 24 GB of memory. Memory is
contained on small cards that are referred to as DIMMs (dual inline memory modules).
Each deskside system can contain four, eight, or twelve DIMMs installed in DIMM slots
located on the system node (mother) board.
The memory DIMM sockets are divided into three 4-DIMM groups (groups 0, 1, and 2).
The instructions in the following sections assume that you know the correct slots in
which to install the memory DIMMs. For information about DIMM configurations and
placement rules, continue reading the rest of this section.
Note: If you have not already done so, remove the right side of the enclosure to access
the DIMMS. Refer to "Preparing the System for Service" on page 44.
Instructions are provided in the following sections:
• "Removing a DIMM" on page 59
• "Verifying Memory Installation" on page 63
These twelve DIMM slots are organized into three groups of four DIMMs each, as shown
in Figure 3-8 on page 58. DIMMs are installed one per DIMM slot, and four at a time
(group of four). Follow these guidelines when installing DIMM groups:
• Memory is increased or decreased in four-DIMM group increments only.
• Each of the four DIMMs that make up a DIMM group must be the same memory
size and speed; however, different groups of DIMMs can differ in memory size or
speed.
• The first four DIMMs (group 0) must be in place for the base module to operate
properly.
• Mixing DIMM groups with different access speeds will cause the memory bus to
default to the speed used for the slowest group.
• The maximum bus speed for a completely full set of DIMM memory slots (three
installed groups), defaults to 100 MHz or 133 MHz, depending on the type of
DIMMs installed.
Installing or Removing a Memory DIMM
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