–
Populate DDR4 across all available memory channels to maximize
bandwidth.
–
If only 1 DDR4 is populated on the channel then populate it in slot 1 (1A, 1B,
…).
App Direct mode (1LM)
–
In App Direct mode memory is persistent like storage and is accessible
through addressing like memory.
–
Applications are responsible for making data persistent and requires OS/SW
stack changes.
–
Min 1 DDR4 DIMM per IMC (i.e. 2 DDR4 per CPU).
–
Min 1 NVM/LRDIMM which must be on iMC0.
–
If only 1 DDR4 is populated on the channel then populate it in slot 1 (1A, 1B,
…).
10.2.3.3
DDR4 DIMM and NVM/LRDIMM population rules
All modes
–
On Cascade Lake CPU, populate NVM/LRDIMM on IMC0 before IMC1.
–
Populating DRAM and/or NVM/LRDIMM on IMC0 only and leaving IMC1
empty is supported on Purley.
–
Populate identical DDR4 DIMM only.
–
Populate identical NVM/LRDIMM only.
Main memory
400 Upgrade and Maintenance Manual TX2550 M5