Dell PowerEdge R640 EMC PowerEdge R640 Installation and Service Manual - Page 96

Mode-specific guidelines

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Table 53. 2 socket DCPMM configurations (continued) No. of CPUs in the Server DCPMM DRAM Populati Populati on on DRAM Capaci ty (GB) DCPM Operating M system Capacit Memory in y (GB) Memory Mode (GB) 2 512 GB x 64 GB x 768 4,096 4,096 8 12 2 512 GB x 64 GB x 768 6,144 6,144 12 12 2 512 GB x 128 GB x 1,536 6,144 6,144 12 12 2 256 GB x 16 GB x 192 2,048 2,048 8 12 2 256 GB x 32 GB x 384 2,048 2,048 8 12 2 256 GB x 32 GB x 384 3,072 3,072 12 12 2 256 GB x 64 GB x 768 2,048 N/A 8 12 2 256 GB x 64 GB x 768 3,072 3,072 12 12 2 256 GB x 128 GB x 1,536 3,072 N/A 12 12 Total Memory (GB) Total Memor y per CPU (GB) 4,864 2,432 Ratio DRAM to Optane Memory 1 : 5.3 6,912 3,456 1 : 8 7,680 3,840 1 : 4 2,240 1,120 1 : 10.7 2,432 1,216 1 : 5.3 3,456 1,728 1 : 8 2,816 1,408 1 : 2.7 3,840 1,920 1 : 4 4,608 2,304 1 : 2 Requi Suppor res an ted in M or App L Direct CPU Mode Support ed in Memory Mode L SKU Yes Yes L SKU Yes Yes L SKU Yes Yes L SKU Yes Yes L SKU Yes Yes L SKU Yes Yes L SKU Yes No L SKU Yes Yes L SKU Yes No NOTE: There are limited configurations available for Dual Socket Servers with only one CPU populated. NOTE: DCPMM is supported on systems with 1600W and 2400W PSU configuration. NOTE: • High Performance Fan is required with DCPMM. • GPU and FGPA cards are not supported. • Mid or rear storage is not supported. • Front 12 x 3.5-inch drives are not supported. Mode-specific guidelines The configurations allowed depend on the memory mode selected in the System BIOS. Table 54. Memory operating modes Memory Operating Mode Optimizer Mode Description The Optimizer Mode if enabled, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory performance. NOTE: DCPMM supports only Optimizer mode. Mirror Mode The Mirror Mode if enabled, the system maintains two identical copies of data in memory, and the total available system memory is one half of the total installed physical memory. Half of the installed memory is used to mirror the active memory modules. This feature provides maximum reliability and enables the system to continue running even during a catastrophic memory failure by switching over to the mirrored copy. The installation guidelines to enable 96 Installing and removing system components

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Table 53. 2 socket DCPMM configurations (continued)
No. of
CPUs
in the
Server
DCPMM
Populati
on
DRAM
Populati
on
DRAM
Capaci
ty
(GB)
DCPM
M
Capacit
y (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
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:
DCPMM is supported on systems with 1600W and 2400W PSU configuration.
NOTE:
•
High Performance Fan is required with DCPMM.
•
GPU and FGPA cards are not supported.
•
Mid or rear storage is not supported.
•
Front 12 x 3.5-inch drives are not supported.
Mode-specific guidelines
The configurations allowed depend on the memory mode selected in the System BIOS.
Table 54. Memory operating modes
Memory Operating Mode
Description
Optimizer Mode
The
Optimizer Mode
if enabled, the DRAM controllers operate
independently in the 64-bit mode and provide optimized memory
performance.
NOTE:
DCPMM supports only Optimizer mode.
Mirror Mode
The
Mirror Mode
if enabled, the system maintains two identical
copies of data in memory, and the total available system memory is
one half of the total installed physical memory. Half of the installed
memory is used to mirror the active memory modules. This feature
provides maximum reliability and enables the system to continue
running even during a catastrophic memory failure by switching
over to the mirrored copy. The installation guidelines to enable
96
Installing and removing system components