Table 24. Memory slot and channel identification (continued)
Channel CH1 CH0 CH1 CH0 CH0 CH1 CH0 CH1
Slot No. 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0
DIMM No. 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
• Slot No.: DIMM slot number in each memory channel. Each memory channel has two DIMM slots: slot 0
(further from the processor) and slot 1 (closer to the processor).
• DIMM No.: DIMM slot number on the processor board. Each processor has 16 DIMM slots.
Memory module installation guideline
• For the installation rules and population sequence, see
“Independent mode installation order” on page
63
and “Mirroring mode installation order” on page 64.
• At least one DIMM is required for each processor. Install at least eight DIMMs per processor for good
performance.
• 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.
Installation order for E-Cores series processors
See the section to understand the memory module installation order for E-Cores series processors.
For RDIMMs and 10x4 RDIMMs, the following two memory modes are available.
Independent mode installation order
In independent mode, memory channels can be populated with DIMMs in any order and you can populate all
channels for each processor in any order with no matching requirements. Independent mode provides the
highest level of memory performance, but lacks failover protection. The DIMM installation order for
independent mode varies based on the number of processors and memory modules installed in the server.
Independent mode installation rules
Follow the rules below when installing memory modules in independent mode:
• All DDR5 memory modules must operate at the same speed in the same system.
• Memory population must be identical between processors.
• Memory modules from different vendors are supported.
• In each memory channel, populate the slot farthest from the processor (slot 0) first.
• All DIMMs must be all DDR5 DIMMs.
• x8 DIMMs and x4 DIMMs cannot be mixed in a system.
• All memory modules to be installed must be of the same type.
• All memory modules in a system must have the same number of ranks.
The following table shows the sequence of populating memory modules for independent mode when only
one processor (processor 1) is installed.
Table 25. Independent mode with one processor
Total
DIMMs
Processor 1
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
8
DIMMs
Note
16 14 12 10 7 5 3 1
Chapter 5. Hardware replacement procedures 63
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