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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.
These slots have black ejector levers.
■
In fully-populated configurations (32 DIMMs), DIMMs must be installed in all slots (
CH0
and
CH1
)
Note -
The DIMM sparing feature is available only in fully-populated servers.
■
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
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
“Identifying DIMMs” on page 71
Related Information
■
■
“Identifying DIMMs” on page 71
■
■
■
■
“Server Upgrade Process” on page 56
■
“Processor Module Configuration” on page 57
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SPARC T8-4 Server Service Manual • January 2022
Summary of Contents for SPARC T8-4
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