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Dell EMC PowerEdge R940xa Installation and Service Manual

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PMem installation guidelines

The following are the recommended guidelines for installing data center persistent memory module (PMem) memory modules:
  • Each system supports maximum of one PMem memory module per channel.
    NOTE If two different PMem capacities are mixed, an F1/F2 warning is displayed as the configuration is not supported.
  • PMem can be mixed with RDIMM, LRDIMM, and 3DS LRDIMM.
  • Mixing of DDR4 DIMM types (RDIMM, LRDIMM, and 3DS LRDIMM), within channels, for Integrated Memory Controller (iMC), or across sockets are not supported.
  • Mixing of PMem operating modes (App Direct, Memory Mode) is not supported.
  • If only one DIMM is populated on a channel, it should always go to the first slot in that channel (white slot).
  • If a PMem and a DDR4 DIMM are populated on the same channel, always plug PMem on second slot (black slot).
  • If the PMem is configured in Memory Mode, the recommended DDR4 to PMem capacity ratio is 1:4 to 1:16 per iMC.
  • PMems' cannot be mixed with other PMems capacities or NVDIMMs.
  • Mixing different capacities of RDIMMs and LRDIMMs are not allowed when PMem is installed.
  • PMems of different capacities are not allowed.
  • PMem does not support GPU configurations

For more information about the supported PMem configurations, see the Dell EMC PMem User 's Guide at https://www.dell.com/support/home/products/server_int/server_int_poweredge.

Table 1. 2 socket PMem configurationsPMem configurations (2 socket)
No. of CPUs in the Server PMem Population DRAM Population DRAM Capacity (GB) PMem Capacity (GB) Operating system Memory in Memory Mode (GB) Total Memory (GB) Total Memory per CPU (GB) Ratio DRAM to Optane Memory Requires an M or L CPU Supported in App Direct Mode Supported in Memory Mode
2 128 GB x 1 16 GB x 12 192 128 N/A 320 160 1 : 0.7 No Yes No
2 128 GB x 2 16 GB x 12 192 256 N/A 448 224 1 : 1.3 No Yes No
2 128 GB x 4 16 GB x 8 128 512 512 640 320 1 : 4 No Yes Yes
2 128 GB x 4 16 GB x 12 192 512 N/A 704 352 1 : 2.7 No Yes No
2 128 GB x 8 16 GB x 12 192 1,024 1,024 1,216 608 1 : 5.3 No Yes Yes
2 128 GB x 12 16 GB x 12 192 1,536 1,536 1,728 864 1 : 8 No Yes Yes
2 128 GB x 1 32 GB x 12 384 128 N/A 512 256 1 : 0.3 No Yes No
2 128 GB x 2 32 GB x 12 384 256 N/A 640 320 1 : 0.7 No Yes No
2 128 GB x 4 32 GB x 12 384 512 N/A 896 448 1 : 1.3 No Yes No
2 128 GB x 8 32 GB x 12 384 1,024 N/A 1,408 704 1 : 2.7 No Yes No
2 128 GB x 12 32 GB x 12 384 1,536 1,536 1,920 960 1 : 4 No Yes Yes
2 128 GB x 4 64 GB x 12 768 512 N/A 1,280 640 1 : 0.7 No Yes No
2 128 GB x 8 64 GB x 12 768 1,024 N/A 1,792 896 1 : 1.3 No Yes No
2 128 GB x 12 64 GB x 12 768 1,536 N/A 2,304 1,152 1 : 2 L SKU Yes No
2 128 GB x 12 128 GB x 12 1,536 1,536 N/A 3,072 1,536 1 : 1 L SKU Yes No
2 512 GB x 8 32 GB x 12 384 4,096 4,096 4,480 2,240 1 : 10.7 L SKU Yes Yes
2 512 GB x 12 32 GB x 12 384 6,144 6,144 6,528 3,264 1 : 16 L SKU Yes Yes
2 512 GB x 8 64 GB x 12 768 4,096 4,096 4,864 2,432 1 : 5.3 L SKU Yes Yes
2 512 GB x 12 64 GB x 12 768 6,144 6,144 6,912 3,456 1 : 8 L SKU Yes Yes
2 512 GB x 12 128 GB x 12 1,536 6,144 6,144 7,680 3,840 1 : 4 L SKU Yes Yes
2 256 GB x 8 16 GB x 12 192 2,048 2,048 2,240 1,120 1 : 10.7 L SKU Yes Yes
2 256 GB x 8 32 GB x 12 384 2,048 2,048 2,432 1,216 1 : 5.3 L SKU Yes Yes
2 256 GB x 12 32 GB x 12 384 3,072 3,072 3,456 1,728 1 : 8 L SKU Yes Yes
2 256 GB x 8 64 GB x 12 768 2,048 N/A 2,816 1,408 1 : 2.7 L SKU Yes No
2 256 GB x 12 64 GB x 12 768 3,072 3,072 3,840 1,920 1 : 4 L SKU Yes Yes
2 256 GB x 12 128 GB x 12 1,536 3,072 N/A 4,608 2,304 1 : 2 L SKU Yes No
Table 2. 4 socket PMem configurationsPMem configurations (4 socket)
No. of CPUs in the Server PMem Populationn DRAM Population DRAM Capacity (GB) PMem Capacity (GB) Operating system Memory in Memory Mode (GB) Total Memory (GB) Total Memory per CPU (GB) Ratio DRAM to Optane Memory Requires an M or L CPU Supported in App Direct Mode Supported in Memory Mode
4 128 GB x 16 16 GB x 24 384 2,048 2,048 2,432 608 1 : 5.3 No Yes Yes
4 128 GB x 24 16 GB x 24 384 3,072 3,072 3,456 864 1 : 8 No Yes Yes
4 128 GB x 16 32 GB x 24 768 2,048 N/A 2,816 704 1 : 2.7 No Yes No
4 128 GB x 24 32 GB x 24 768 3,072 3,072 3,840 960 1 : 4 No Yes Yes
4 128 GB x 24 64 GB x 24 1,536 3,072 N/A 4,608 1,152 1 : 2 L SKU Yes No
4 128 GB x 24 128 GB x 24 3,072 3,072 N/A 6,144 1,536 1 : 1 L SKU Yes No
4 512 GB x 16 32 GB x 24 768 8,192 8,192 8,960 2,240 1 : 10.7 L SKU Yes Yes
4 512 GB x 24 32 GB x 24 768 12,288 12,288 13,056 3,264 1 : 16 L SKU Yes Yes
4 512 GB x 16 64 GB x 24 1,536 8,192 8,192 9,728 2,432 1 : 5.3 L SKU Yes Yes
4 512 GB x 24 64 GB x 24 1,536 12,288 12,288 13,824 3,456 1 : 8 L SKU Yes Yes
4 512 GB x 24 128 GB x 24 3,072 12,288 12,288 15,360 3,840 1 : 4 L SKU Yes Yes
4 256 GB x 16 16 GB x 24 384 4,096 4,096 4,480 1,120 1 : 10.7 L SKU Yes Yes
4 256 GB x 24 16 GB x 24 384 6,144 6,144 6,528 1,632 1 : 16 L SKU Yes Yes
4 256 GB x 16 32 GB x 24 768 4,096 4,096 4,864 1,216 1 : 5.3 L SKU Yes Yes
4 256 GB x 24 32 GB x 24 768 6,144 6,144 6,912 1,728 1 : 8 L SKU Yes Yes
4 256 GB x 16 64 GB x 24 1,536 4,096 N/A 5,632 1,408 1 : 2.7 L SKU Yes No
4 256 GB x 24 64 GB x 24 1,536 6,144 6,144 7,680 1,920 1 : 4 L SKU Yes Yes
4 256 GB x 24 128 GB x 24 3,072 6,144 N/A 9,216 2,304 1 : 2 L SKU Yes No
NOTE

PMem is supported on systems with 1600W and 2400 W PSU configuration.

Max ambient Temperature is 25C.

Max PMem TDP is 15 W.

PMem supports up to 4 NVMe hard drive (2.5-inches x 32 backplane).

PMem does not support GPU configuration.

Two CPU configurations with 2.5-inches x 32 backplane, does not support 205 W/200 W and 6244/6246/6240Y CPU.

Table 3. PMem Thermal RestrictionsThe following table shows the PMem Thermal Restriction for the R940xa system:
PMem Support V2 Air-shroud V1 Air-shroud
8x 2.5-inch SAS/SATA

30C ambient temperature support, 25C ambient temperature with 256GB LRDIMMs

25C ambient temperature support, not supported with 256GB LRDIMM

24x 2.5-inch SAS/SATA

30C ambient temperature support, not supported with 256GB LRDIMM

25C ambient temperature support, not supported with 256GB LRDIMM

32x 2.5-inch SAS/SATA or mixed NVMe

30C ambient temperature support, not supported with 256GB LRDIMM

25C ambient temperature support, not supported with 256GB LRDIMM

NOTE PMem does not support GPU configuration.

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