Plugging rules for memory modules in the 5148-21L, 5148-22L, 8247-21L, 8247-22L, 8284-21A, or 8284-22A system

Find information about the configurations and rules that apply to memory modules for the 5148-21L, 5148-22L, 8247-21L, 8247-22L, 8284-21A, or 8284-22A system. This information helps you to install memory modules in the system.

Figure 1 shows the locations of the memory modules for the 8247-22L or 8284-22A system with two system processors configuration, and Table 1 provides information about the plugging rules for the memory modules in the 5148-21L, 5148-22L, 8247-21L, 8247-22L, 8284-21A, or 8284-22A system.
Figure 1. Memory module plugging sequence
Memory module plugging sequence
The following table lists the feature codes of the memory modules that are supported on the 5148-21L, 5148-22L, 8247-21L, 8247-22L, 8284-21A, or 8284-22A system:
System Supported feature codes (FC)
8284-22A
  • FC EM83, FC EM84, and FC EM85 (DDR3)
  • FC EM96, FC EM97, and FC EM98 (DDR4)
8284-21A, 5148-21L, or 5148-22L
  • FC EM96 and FC EM97 (DDR4)
8247-21L, 8247-22L, 5148-21L, or 5148-22L
  • FC EL3P, FC EL3Q, and FC EL3R (DDR3)
  • FC EM96, FC EM97, and FC EM98 (DDR4)
Note: To determine if your memory modules have the same feature code, compare the part numbers of the memory modules installed in the system to the memory modules being installed. If you need additional help, contact your next level of support.
Notes:
  • The 5148-21L, 5148-22L, 8247-21L, 8247-22L, or 8284-22A system supports memory modules of 16 GB, 32 GB, and 64 GB.
  • The 8284-21A system supports memory modules of 16 GB and up to 4 x 32 GB.
  • The 8247-21L and 8284-21A systems support a minimum of one memory module and provide a minimum of 16 GB memory.
  • The 8247-22L or 8284-22A system supports a minimum of two (a pair of) memory modules and provides a minimum of 32 GB memory.
  • A memory module pair must be identical and can be different from the other pairs of memory modules.
  • The mixing of DDR3 and DDR4 memory in the system is not allowed.
    Attention: IBM strongly recommends that the customer review the minimum firmware levels that are required for DDR4 memory DIMMS and recommendation as to how to plug them to prevent any exposures.
Table 1. Memory module plugging sequence for 5148-21L, 5148-22L, 8247-21L, 8247-22L, 8284-21A, or 8284-22A
Number of system processors Plugging sequence
One system processor (8247-21L, 8284-21A, or 5148-21L)
  1. Install the first memory module at location C16.
  2. Install the second memory module at location C18.
    Note: First and second memory modules must be identical.
  3. Install the third identical memory module pair at location C21 and C23.
  4. Install the fourth identical memory module pair at location C17 and C19.
  5. Install the fifth identical memory module pair at location C20 and C22.
Two system processors (8247-22L, 8284-22A, 5148-22L)
  1. Install the first identical memory module pair at location C16 and C18.
  2. Install the second identical memory module pair at location C24 and C26.
  3. Install the third identical memory module pair at location C21 and C23.
  4. Install the fourth identical memory module pair at location C29 and C31.
  5. Install the fifth identical memory module pair at location C17 and C19.
  6. Install the sixth identical memory module pair at location C25 and C27.
  7. Install the seventh identical memory module pair at location C20 and C22.
  8. Install the eighth identical memory module pair at location C28 and C30.