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80 Sun Fire 280R Server Owner’s Guide • January 2001
About System Memory
The system’s main logic board provides eight slots for high-capacity dual in-line
memory modules (DIMMs), divided into two groups of four DIMMs each that may
be subdivided again into four logical banks. For the DIMM bank organization and
numbering scheme, see the table on next page, or see “DIMM Failure” on page 196.
The system supports Sun standard 200-pin, 3.3-volt, 60-nanosecond memory
modules. Modules of 128-, 256-, 512-, or 1024-Mbyte capacity can be installed in the
system. Total main memory capacity is expandable up to 8 Gbytes.
Memory modules are delicate. Ensure that you take appropriate precautions to
avoid damaging them through electrostatic discharge. The memory modules must
be replaced or installed by a qualified service provider. For information about
removing and installing DIMMs, see the Sun Fire 280R Server Service Manual.
Configuration Rules
The following memory configuration rules apply to your system:
■ At least one memory group consisting of 4 slots (slots J0101, J0203, J0305, and
J0407; or slots J0100, J0202, J0304, and J0406) must be filled for the system to boot.
■ All DIMMs in a group must be of the same type.
Note – DIMM capacities can differ from one group to the next—for example, four
128-Mbyte DIMMs installed in group 0 and four 256-Mbyte DIMMs installed
in group 1 is permissible, but performance may be impacted.
Caution – DIMMs are made of electronic components that are extremely sensitive
to static electricity. Static from your clothes or work environment can destroy the
modules. Do not remove any DIMM from its antistatic packaging until you are ready
to install it on the system board. Handle the modules only by their edges. Do not
touch the components or any metal parts. Always wear a grounding strap when you
handle the modules.