Owners Manual

Table 23. 4 socket PMem configurations (continued)
N
o
. of CPUs in the Server
PMem
Population
DRAM
Population
DRAM
Capaci
ty
(GB)
PMem
Capaci
ty
(GB)
Operat
ing
system
Memor
y in
Memor
y Mode
(GB)
Total
Memor
y (GB)
Total
Memor
y per
CPU
(GB)
Ratio
DRAM
to
Optane
Memor
y
Requir
es an
M or L
CPU
Suppor
ted in
App
Direct
Mode
Suppor
ted in
Memor
y Mode
4256 GB x 16 16 GB x 24 384 4,096 4,096 4,480 1,120 1 : 10.7 L SKU Yes Yes
4256 GB x 24 16 GB x 24 384 6,144 6,144 6,528 1,632 1 : 16 L SKU Yes Yes
4256 GB x 16 32 GB x 24 768 4,096 4,096 4,864 1,216 1 : 5.3 L SKU Yes Yes
4256 GB x 24 32 GB x 24 768 6,144 6,144 6,912 1,728 1 : 8 L SKU Yes Yes
4256 GB x 16 64 GB x 24 1,536 4,096 N/A 5,632 1,408 1 : 2.7 L SKU Yes No
4256 GB x 24 64 GB x 24 1,536 6,144 6,144 7,680 1,920 1 : 4 L SKU Yes Yes
4256 GB x 24 128 GB x 24 3,072 6,144 N/A 9,216 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.
Mode-specific guidelines
The configurations allowed depend on the memory mode selected in the System BIOS.
Table 24. 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 Mirror Mode require that the memory modules be
identical in size, speed, and technology, and they must be populated in sets of 6 per
processor.
Single Rank Spare Mode Single Rank Spare Mode allocates one rank per channel as a spare. If excessive
correctable errors occur in a rank or channel, while the operating system is running, they
are moved to the spare area to prevent errors from causing an uncorrectable failure.
Requires two or more ranks to be populated in each channel.
Multi Rank Spare Mode Multi Rank Spare Mode allocates two ranks per channel as a spare. If excessive
correctable errors occur in a rank or channel, while the operating system is running, they
are moved to the spare area to prevent errors from causing an uncorrectable failure.
Requires three or more ranks to be populated in each channel.
84 Installing and removing system components