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1.2 DCPMM Modes
This section provides additional details on DCPMM modes. Please refer to the information
below to configure your DCPMM memory settings.
Memory Mode (volatile memory)
In Memory Mode, the system treats DCPMM modules as system memory, and DCPMMs
will act as large-capacity DDR4 memory modules. The installed DDR4 DIMMs will become
a caching layer for the DCPMMs and will be hidden from the operating system.
App Direct Mode (non-volatile memory)
In App Direct Mode, DCPMM modules provide all persistent memory features to the
operating system and to the applications that support them. The DDR4 DIMMs will act as
system memory and DCPMMs will act as persistent storage.
Mixed Mode
DCPMMs can be configurated in Mixed Memory Mode with a portion of their capacity used
for Memory Mode operations, and the remaining capacity as persistent memory for App
Direct Mode operations. All DDR4 DIMMs discovered in the system are hidden from the
operating system and act as a caching layer for the DCPMMs Memory Mode portion.
Memory Ratio
In Memory Mode and Mixed Mode configurations, the required ratio of system memory to
DCPMMs is between 1:16 and 1:4 gigabytes. In order to achieve the best performance,
a ratio of 1:4 is recommended. In Mixed Mode, this ratio requirement applies to system
memory and only the volatile portion of the DCPMMs. The ratio requirement does not apply
to App Direct Mode.
1.3 Specifications
Operating Speed
1st Gen. DCPMMs operate at 2666 MHz DDR4 memory bus speed, and any installed 2933
MHz DDR4 memory will also operate at 2666 MHz.
Capacity
1st Gen. DCPMM modules are offered in capacities of 128GB, 256GB, and 512GB.
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Chapter 1: Introduction
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