Memory Modules; Memory Module Population Rules - Sun Microsystems Sun Fire V20z User Manual

4.5.11

Memory Modules

The following procedure describes how to remove and replace memory modules.
4.5.11.1

Memory Module Population Rules

Note – Use the following information and rules when you use the procedures in this
section to replace or add dual inline memory modules (DIMMs) to the server.
DIMMs used in the server must all be the "Registered DDR 333" type.
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Four DIMMs are supported per CPU. The four DIMM slots for each CPU are
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grouped into two banks that contain two slots each.
The Sun Fire V20z supports either single- or dual-CPU configurations. In a
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single-CPU system, you can only use the four DIMM slots that are adjacent
to CPU0.
In a dual-CPU system, each CPU can use two or four DIMMs; when using only
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two DIMMs for a CPU, populate the bank closest to the CPU first.
DIMMs must be installed in matched pairs (one bank at a time). The two DIMMs
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in a bank must be of the same size, type and vendor.
Each CPU can support two banks of DIMMs. While each bank must contain a pair
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of matching DIMMs, the size and vendor of the DIMMs between banks do not
have to match.
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TABLE 4-1
CPU 0
Example 1
Example 2
Example 3
Example 4
4-30 Sun Fire V20z and Sun Fire V40z Servers User Guide • December 2004
For example, below are some valid sample configurations for CPU0. In each
example, DIMM 1 and DIMM 2 match in size (and vendor), but they do not
have to match DIMM 3 and DIMM 4. DIMM 3 and DIMM 4 must match within
their bank, but they do not have to match DIMM1 and DIMM 2.
Valid Sample DIMM Configurations
BANK 0
DIMM 1 = 512, DIMM 2 = 512
DIMM 1 = 1GB, DIMM 2 = 1GB
DIMM 1 = 1GB, DIMM 2 = 1GB
DIMM 1 = 512, DIMM 2 = 512
BANK 1
DIMM 3 = 1GB, DIMM 4 = 1GB
DIMM 3 = 1GB, DIMM 4 = 1GB
DIMM 3 = 512, DIMM 4 = 512
DIMM 3 = 2GB, DIMM 4 = 2GB