Supported Memory Configurations - Oracle SPARC T8-4 Service Manual

Understanding DIMM Configurations

Supported Memory Configurations

The server supports 16-Gbyte, 32-Gbyte, and 64-Gbyte DIMMs, with up to 4096 Gbytes in a
server fully configured with two processor modules.
Each processor module can be either half populated (16 DIMMs) or fully populated (32
DIMMs).
Consider these population rules when installing, upgrading, or replacing DIMMs in a processor
module:
In half-populated configurations, 16 DIMMs must be installed in all CH0 slots.
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These slots have black ejector levers.
In fully-populated configurations (32 DIMMs), DIMMs must be installed in all slots (CH0
■
and CH1)
Note -
All DIMMs associated with each CMx must be identical (same size, same rank
■
classification).
Mixed configurations are supported (DIMMs associated with CM0 with one size, and
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DIMMs associated with CM1 with a different size) as long as all DIMMs in the server have
a supported rank classification. For example, 32 Gbyte 4Rx4 DIMMs associated with PM0/
CM0, and 64 Gbyte 4Rx4 DIMMs associated with PM0/CM1.
To identify DIMM architecture, see
Related Information
"DIMM FRU Names" on page 73
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"Identifying DIMMs" on page 71
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"Remove a DIMM" on page 78
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"Install a DIMM" on page 81
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"Verify a DIMM" on page 84
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"Server Upgrade Process" on page 56
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"Processor Module Configuration" on page 57
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70 SPARC T8-4 Server Service Manual • January 2022
The DIMM sparing feature is available only in fully-populated servers.
"Identifying DIMMs" on page 71.