Dell EMC PowerEdge R740xd, Installation And Service Manual

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• 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 DCPMM 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 DCPMM and a DDR4 DIMM are populated on the same channel, always plug DCPMM on second slot (black slot).
• If the DCPMM is configured in Memory Mode, the recommended DDR4 to DCPMM capacity ratio is 1:4 to 1:16 per iMC.
• DCPMMs' cannot be mixed with other DCPMMs capacities or NVDIMMs.
• Mixing different capacities of RDIMMs and LRDIMMs are not allowed when DCPMM is installed.
• DCPMMs of different capacities are not allowed.
For more information about the supported DCPMM configurations, see the Dell EMC DCPMM User 's Guide at https://www.dell.com/
support/home/products/server_int/server_int_poweredge .
Table 52. 2 socket DCPMM configurations
No. of
CPUs
in the
Server
DCPMM
Populati
on
DRAM
Populati
on
DRAM
Capaci
ty
(GB)
DCPM
M
Capaci
ty (GB)
Operating
system
Memory in
Memory
Mode (GB)
Total
Memory
(GB)
Total
Memor
y per
CPU
(GB)
Ratio
DRAM to
Optane
Memory
Requi
res an
M or
L
CPU
Suppor
ted in
App
Direct
Mode
Support
ed 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
Installing and removing system components 121