Oracle X5-8 Service Manual page 160

Remove a DIMM
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DIMM Rules
The DIMM installation rule aims to maximize the memory bandwidth available by spreading
the memory across all eight memory channels.
When installing DIMMs, consider the following rules:
All DIMMs in a system should be the same type and size.
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All CMODs should be populated identically.
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The minimum DIMM configuration as shipped from the factory is four 16 GB DIMMs in
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each CMOD, installed is slots D0, D6, D12 and D18.
An upgrade of four DIMMs for each CMOD is allowed in this configuration by installing
four DIMMs in slots D3, D9, D15 and D21.
Aside from an upgrade to the minimum shipped configuration (stated above), DIMMs must
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be added to each CMOD in sets of eight (one for each memory buffer channel). Add eight
DIMMs to each CMOD starting with CMOD 0 and ending with CMOD 3 (four-CMOD
configuration) or CMOD 7 (eight-CMOD configuration). After all CMODs are populated,
go back to CMOD 0 and repeat the sequence adding the next set of eight to each CMOD.
For example: CMOD 0 gets the initial eight DIMMs, followed by CMOD 1 with the next
eight DIMMs, continuing with all CMODs in the configuration. When 32 DIMMs (4-
160 Oracle Server X5-8 Service Manual • December 2015
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