Pmem Installation Guidelines - Dell EMC PowerEdge R640 WNW58 Installation And Service Manual

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 24. 2 socket PMem configurations
No. of PMem DRAM
CPUs Popul Popul
in the ation ation
Serve
r
2 128 GB 16 GB
x 1 x 12
2 128 GB 16 GB
x 2 x 12
2 128 GB 16 GB
x 4 x 8
2 128 GB 16 GB
x 4 x 12
2 128 GB 16 GB
x 8 x 12
2 128 GB 16 GB
x 12 x 12
2 128 GB 32 GB
x 1 x 12
2 128 GB 32 GB
x 2 x 12
2 128 GB 32 GB
x 4 x 12
2 128 GB 32 GB
x 8 x 12
2 128 GB 32 GB
x 12 x 12
2 128 GB 64 GB
x 4 x 12
2 128 GB 64 GB
x 8 x 12
58 Installing and removing system components
DRAM PMem Operating
Capac Capac system
ity ity Memory in
(GB) (GB) Memory
Mode
(GB)
192 128 N/A
192 256 N/A
128 512 512
192 512 N/A
192 1,024 1,024
192 1,536 1,536
384 128 N/A
384 256 N/A
384 512 N/A
384 1,024 N/A
384 1,536 1,536
768 512 N/A
768 1,024 N/A
Total Total Ratio
Memo Memo DRAM to
ry ry per Optane
(GB) CPU Memory
(GB)
320 160 1 : 0.7
448 224 1 : 1.3
640 320 1 : 4
704 352 1 : 2.7
1,216 608 1 : 5.3
1,728 864 1 : 8
512 256 1 : 0.3
640 320 1 : 0.7
896 448 1 : 1.3
1,408 704 1 : 2.7
1,920 960 1 : 4
1,280 640 1 : 0.7
1,792 896 1 : 1.3
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Requires Supported
an M or L in App
CPU Direct
Mode
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
No Yes
Supported
in Memory
Mode
No
No
Yes
No
Yes
Yes
No
No
No
No
Yes
No
No