Each CMIOU in the server contains 8 or 16 DDR4 DIMMs. See DIMM and eUSB Locations in a CMIOU.
Caution - This procedure requires that you handle components that are sensitive to electrostatic discharge. This discharge can cause server components to fail. Follow antistatic precautions to prevent electrostatic damage. See Prevent ESD Damage.
These topics explain how to service DIMMs in the server.