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Optane DIMMs
DRAM DIMMs
per CPU
per CPU
6 X 512 GB
6 X 64 GB
6 X 512 GB
6 X 128 GB
Table 53. App Direct Mode configurations (Single CPU in Dual Socket Systems)
Optane DIMMs
1 X 128 GB
1 X 128 GB
NOTE:
There are limited configurations available for Dual Socket Servers with only one CPU populated.
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
Mirror Mode
Single Rank Spare Mode
Multi Rank Spare Mode
98
Installing and removing system components
Total capacity
per CPU
3456 GB
3840 GB
DRAM DIMMs
6 X 32 GB
6 X 64 GB
2 Socket OS
4 Socket OS
Memory
Memory
capacity
capacity
768 GB
1.5 TB
1.5 TB
3 TB
Total capacity
320 GB
512 GB
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.
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 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 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.
With single rank memory sparing enabled, the system memory
available to the operating system is reduced by one rank per
channel.
For example, in a dual-processor configuration with 24x 16 GB dual-
rank memory modules, the available system memory is: 3/4 (ranks/
channel) × 24 (memory modules) × 16 GB = 288 GB, and not 24
(memory modules) × 16 GB = 384 GB. For multi rank sparing, the
multiplier changes to 1/2 (ranks/channel).
2 Socket App
Direct Optane
capacity
6 TB
6 TB
OS Memory capacity
192 GB
384 GB
4 Socket App
Direct Optane
capacity
12 TB
12 TB
App Direct Optane
capacity
128 GB
128 GB
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