Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 339

*
The DIMM population will exactly be identical for the mirrored channels.
DDR5 only - memory population rules, 2DPC configuration
– Unbalanced configurations can lead to significantly reduced bandwidth
because the system will fracture the memory space into multiple regions.
– If two DIMMs with different capacity are installed in one channel, the one
with higher capacity has to be placed in slot 1 of a channel. E.g. 1A, 1B, ....
– Channel capacities - limited to 2 different Channel capacities per processor
socket. This rule is not checked by BIOS. However, violating this rule may
result in populated memory not being mapped and therefore not available
for system use.
– Rank sparing, ADDDC, channel mirroring, hemisphere modes are not
supported with SGX.
– Rank sparing mode is not supported.
– SPR+HBM does not support hemi/SNC2 modes
For more information, see the "FUJITSU Server PRIMERGY Option
Product System Configuration Diagram (Notes)".
RX2540 M7
SGX is supported
Upgrade and Maintenance Manual
Main memory
339