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 (available by June 2019)
128 GB, 256 GB, or 512 GB DCPMMs
Note
List of supported memory module is different for 1st generation (Skylake) and 2nd generation (Cascade Lake) Intel Xeon processors. Make sure to install compatible memory modules to avoid system error.For a list of supported DIMMs, see: Lenovo ServerProven website.
The following illustration helps you to locate the memory slots on the system board.
Figure 1. DIMM locations
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).
| Processor | CPU2 | CPU1 | ||||||||||||||
| Integrated Memory Controller (iMC) | iMC1 | iMC0 | iMC1 | iMC0 | ||||||||||||
| Channel (CH) | CH2 | CH1 | CH0 | CH0 | CH1 | CH2 | CH2 | CH1 | CH0 | CH0 | CH1 | CH2 | ||||
| Slot | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 |
| DIMM number | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
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