For additional information, including how to prepare the system for servicing, how to remove a CMOD, and how to remove or replace DIMMs, see Removing and Installing Components.
Each CMOD has 32 DIMM slots, with 16 allocated to each CPU. CMODs are shipped with configurations of 16 or 32 DIMMs, meaning that each CPU has either 8 or 16 DIMMs.
On a CMOD with 16 DIMMs, you can replace DIMMs, and you can add additional DIMMs.
On a CMOD with 32 DIMMs, you can replace DIMMs, but because they are fully populated, you cannot add DIMMs.
The rules for adding and replacing DIMMs are:
When you replace DIMMs, you must match parameters.
When you add DIMMs, you must match parameters and populate them in the specified order.