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Memory module installation rules

Memory modules must be installed in a specific order based on the memory configuration that you implement on your server.

Your server has 16 memory slots, and supports the following types of memory modules depending on the processors installed:
  • For Intel® Xeon® SP Gen 1 processors:

    • TruDDR4 2666, single-rank or dual-rank, 8 GB/16 GB/32 GB RDIMMs

    • TruDDR4 2666, quad-rank, 64 GB LRDIMMs

  • For Intel® Xeon® SP Gen 2 processors:

    • TruDDR4 2666, single-rank or dual-rank, 16 GB/32 GB RDIMMs

    • DDR4 2933, single-rank or dual-rank, 8 GB/16 GB/32 GB/64 GB RDIMMs

    • 128 GB, 256 GB, or 512 GB DCPMMs

For a list of supported memory options, see: Lenovo ServerProven website
The following illustration helps you to locate the memory slots on the system board.
Figure 1. DIMM locations
DIMM locations on the system board
The following table shows the relationship between the processors, memory controllers, memory channels, slots, and DIMM numbers. For each memory controller, channel 0 has two DIMM slots (slot 0, furthest from the processor, and slot 1, closest to the processor), and channel 1 and channel 2 have only one DIMM slot (slot 0).
ProcessorCPU2CPU1
Integrated Memory Controller (iMC)iMC1iMC0iMC1iMC0
Channel (CH)CH2CH1CH0CH0CH1CH2CH2CH1CH0CH0CH1CH2
Slot0001100000011000
DIMM number16151413121110987654321