Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 338

Main memory
– Rank sparing mode is not supported.
For more information, see the "FUJITSU Server PRIMERGY Option
Product System Configuration Diagram (Notes)".
Figure 200: Normal mode
D
*
Figure 201: Mirroring mode
D
338
DDR5 DIMM is installed
SGX is supported
DDR5 DIMM is installed
Upgrade and Maintenance Manual RX2540 M7