Placement rules for memory in the 8001-12C or 8001-22C system

Learn about the configurations and rules that apply to adding memory to the IBM® Power® System S821LC (8001-12C) or the IBM Power System S822LC for Big Data (8001-22C) system.

Table 1 lists the supported memory DIMM feature codes and Table 2 shows the allowable memory capacity points for the 8001-12C or 8001-22C system.
  • Mixing of memory feature codes is not allowed.
  • Mixing of memory from different manufacturers is not allowed.
  • You must add four memory DIMMs at a time.
  • The memory DIMMs need to be added in a sequence. Use Table 3 and Figure 1 to determine the memory placement.
Table 1. Memory DIMM feature codes
Supported feature codes (FC) Size
EMM0 4 GB Memory DDR4 ISRDIMM
EMM1 8 GB Memory DDR4 ISRDIMM
EMM2 16 GB Memory DDR4 ISRDIMM
EMM3 32 GB Memory DDR4 ISRDIMM
Table 2. Memory configuration as a function of the number of DIMMs. You read this table by selecting the individual DIMM size row in the leftmost column, then move to the right and select the columns for the memory capacity. The value that is listed is the quantity of the memory feature code that can be ordered, which corresponds to the DIMM size in the leftmost column.
DIMM Size DIMMs DIMMs DIMMs DIMMs DIMMs DIMMs DIMMs DIMMs DIMMs DIMMs
Total Memory 16 GB 32 GB 48 GB 64 GB 96 GB 128 GB 192 GB 256 GB 384 GB 512 GB
4 GB 4 (default) 8 12 16            
8 GB   4   8 12 16        
16 GB       4   8 12 16    
32 GB           4   8 12 16
Table 3. Memory plugging sequence
Slot Location DIMM Quantity Plugging Sequence
P1M1 A and B, P1M2 A and B 4 1
P2M1 A and B, P2M2 A and B 4 2
P1M1 C and D, P1M2 C and D 4 3
P2M1 C and D, P2M2 C and D 4 4
Figure 1. Memory slot locations and plugging sequence
Memory slot locations and plugging sequence
Parent topic: Installing memory in the 8001-12C system
Parent topic: Installing memory in the 8001-22C system


Last updated: Tue, November 17, 2020