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•
"Memory mirroring mode" on page 65
–
"Installation order: memory mirroring with two processors" on page 67
–
"Installation order: memory mirroring with four processors" on page 68
•
"Memory sparing mode" on page 70
–
"Installation order: memory sparing with two processors" on page 73
–
"Installation order: memory sparing with four processors" on page 74
The following memory configurations and population sequences are supported with DC Persistent Memory
Modules (DCPMMs).
•
"App Direct Mode" on page 78
–
"Installation order: App Direct Mode with two processors" on page 78
–
"Installation order: App Direct Mode with four processors" on page 80
•
"Memory Mode" on page 82
–
"Installation order: Memory Mode with two processors" on page 82
–
"Installation order: Memory Mode with four processors" on page 83
•
"Mixed Memory Mode" on page 84
–
"Installation order: Mixed Memory Mode with two processors" on page 84
–
"Installation order: Mixed Memory Mode with four processors" on page 85
Memory module installation guideline
There are a number of criteria that must be followed when selecting and installing memory modules in your
server.
Memory installation requirements:
• A label on each DIMM identifies the DIMM type. This information is in the format xxxxx nRxxx PC4-
xxxxx-xx-xx-xxx. Where n indicates if the DIMM is single-rank (n=1) or dual-rank (n=2).
• At least one DIMM is required for each processor. Install at least six DIMMs per processor for good
performance.
• The following table includes all the feasible combinations of different types of DIMMs:
Table 35. DIMM compatibility
DIMM Types
RDIMM
LRDIMM
3DS-RDIMM
• When you replace a DIMM, the server provides automatic DIMM enablement capability without requiring
you to use the Setup utility to enable the new DIMM manually.
Attention:
• Mixing x4 and x8 DIMMs in the same channel is allowed.
• Install DIMMs of the same speed for optimal performance. Otherwise, the BIOS will find and run the
lowest speed among all channels.
• Always populate DIMMs with the maximum number of ranks in the farthest DIMM slot, followed by the
nearest DIMM slot.
RDIMM
V
X
X
LRDIMM
X
V
X
Chapter 3
3DS-RDIMM
X
X
V
.
Server hardware setup
55
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