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Dell EMC PowerEdge R640 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.

For more information about the supported PMem configurations, see the Dell EMC PMem User 's Guide at 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
NOTE:There are limited configurations available for Dual Socket Servers with only one CPU populated.
NOTE: PMem is supported on systems with 1600W and 2400W PSU configuration.
NOTE:
  • High Performance Fan is required with PMem.
  • GPU and FGPA cards are not supported.
  • Mid or rear storage is not supported.
  • Front 12 x 3.5-inch drives are not supported.

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