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Installing Upgrades 65
System Memory
Your computer supports Rambus dynamic random-access memory
(RDRAM) Rambus in-line memory modules (RIMMs) in 64-, 128-, 256-,
and 512-megabyte (MB) capacities (see "Sample Memory Module
Configurations"). Each socket that does not contain a RIMM must contain
a Rambus continuity RIMM (CRIMM). To locate the RIMM sockets on the
system board, see "System Board Components."
System Memory Installation Guidelines
When installing memory modules in the system board sockets, observe the
following guidelines:
• To reach the maximum 2-gigabyte (GB) memory total, you must
install four 512-MB RIMMs that each have a maximum of 16 memory
devices. The system supports no more than a total of 64 memory
devices on all installed RIMMs.
• See "RIMM Label" for the location of the label on a RIMM that
identifies the number of memory devices it contains. You can also
determine the number of memory devices installed through the
System Memory option in system setup.
NOTE: The computer does not support RIMMs with six memory devices.
• Each RIMM socket must be occupied either by a RIMM or a CRIMM,
and must be upgraded in matched pairs of identical capacity in slots 1
and 2 or slots 3 and 4.
• Mixed RIMM pairs provides a capacity equal to the sum of the four
RIMMs; mixed pairs of RIMMs that provide error checking and
correction (ECC) and non-ECC will all function as non-ECC.
• Be sure to install a RIMM in socket 1 first (closest to the processor)
before installing modules in the other sockets.
• The system board supports PC600 and PC800 memory modules.
PC700 memory is supported, but it will operate at PC600 speeds.