For Optane PMem modules, the following two modes are available:
●
App Direct mode
●
DDR4 DIMM operates as main memory
●
Optane PMem module operates as non-volatile memory or storage
device
●
Memory mode
● DDR4 DIMM operates as cache
● Optane PMem module operates as main memory
App Direct mode and Memory mode can be used simultaneously.
10.2.2 General memory population rules
–
Non-ECC DIMMs are not supported on this platform.
–
All DIMMs must be either all DDR4 DIMMs and/or DDR4 DIMMs and
Optane PMem modules.
–
Mixing of LRDIMM with RDIMM type is not allowed per platform (i.e. the
same channel, across different channels, and across different sockets).
–
Mixing of non-3DS and 3DS RDIMMs is not allowed in platform.
–
Mixing of Optane PMem modules with RDIMMs or with LRDIMMs is
supported.
–
DIMMs with different frequencies can be mixed in the system, but lowest
frequency determines the system memory speed.
–
There should be at least one DDR4 DIMM per CPU socket.
–
If only one DIMM is populated in a channel, then populate it in the slot
furthest away from CPU (i.e. the black slot).
–
Mixing Optane PMem capacities or generations or DDR4 capacities and
types within a socket or across sockets is not supported for Optane PMem
configurations.
–
When different rank DIMMs are populated for 2DPC, always populate the
higher number rank DIMM first (starting from the black slot), for example,
first octal rank, then quad rank, then dual rank, and last single rank DIMM.
Main memory
332 Upgrade and Maintenance Manual RX2540 M6
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