Lenovo ThinkSystem SR550 Maintenance Manual page 135

• For Intel Xeon SP Gen 2:
– Minimum: 8 GB (only one processor installed and only one 8 GB RDIMM installed in the CPU1 DIMM3
slot)
– Maximum: 768 GB (two processors installed and one 64 GB RDIMM installed in each of the 12 memory
module slots)
– Type:
– TruDDR4 2666, single-rank or dual-rank, 16 GB/32 GB RDIMMs with ECC technology
– TruDDR4 2933, single-rank or dual-rank, 8 GB/16 GB/32 GB/64 GB RDIMMs with ECC technology
For a list of supported memory module options, see:
Notes: Before installing a memory module, ensure that all memory modules to be installed must be of the
same type. Your server supports the following types of memory modules:
• TruDDR4 RDIMM with ECC technology
• TruDDR4 LRDIMM with ECC technology
The following illustration helps you to locate the memory module slots on the system board.
Figure 100. Memory module slots on the system board
The following memory configurations are available:
• "Independent mode" on page 127
• "Mirroring mode" on page 128
• "Rank sparing mode" on page 129
Independent mode
Independent mode provides high performance memory capability. You can populate all channels with no
matching requirements. Individual channels can run at different memory module timings, but all channels
must run at the same interface frequency.
The following table shows the memory module population sequence for independent mode when only one
processor (CPU1) is installed.
Note: If there are three identical memory modules to be installed for CPU1, and the three memory modules
have the same Lenovo part number, install the three memory modules in slots 1, 2, and 3.
https://static.lenovo.com/us/en/serverproven/index.shtml
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Chapter 3 Hardware replacement procedures
127