Dell EMC PowerEdge R940 Installation And Service Manual page 70

● 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 23. 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
2 128 GB 64 GB
x 12 x 12
2 128 GB 128 GB
x 12 x 12
2 512 GB 32 GB
x 8 x 12
70 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
768 1,536 N/A
1,536 1,536 N/A
384 4,096 4,096
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
2,304 1,152 1 : 2
3,072 1,536 1 : 1
4,480 2,240 1 : 10.7
https://
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
L SKU Yes
L SKU Yes
L SKU Yes
Supported
in Memory
Mode
No
No
Yes
No
Yes
Yes
No
No
No
No
Yes
No
No
No
No
Yes