Consider the following points: DIMM plugging for the configurations in each CPC drawer do not have to be similar. Each  memory 5 slot DIMM bank must have the same DIMM size; however, a drawer can have a mix  of DIMM banks. Table 2-7 lists the memory population by DIMM bank for the 15  configurations that are listed in Table 2-6 on page 59. As an example, for configuration #14, memory positions MD06-MD10 are populated with five  128 GB DIMMS. GLYPH<SM590000> A CPC drawer always contains a minimum of 15 32GB DIMMs as listed in drawer  configuration number 19 in Table 2-6 on page 59. GLYPH<SM590000> A CPC drawer can have more memory installed than is enabled. The amount of memory  that can be enabled by the client is the total physically installed memory minus the RAIM  amount (20%) and minus the 256 GB of HSA memory. GLYPH<SM590000> A CPC drawer can have available unused memory, which can be ordered as a memory  upgrade and enabled by LIC-CC without DIMM changes. GLYPH<SM590000> DIMM changes require a disruptive power-on reset (POR) on z15 with a single CPC  drawer. DIMM changes can be done concurrently on z15 models with multiple CPC  drawers using Enhanced Drawer Availability (EDA). Table 2-7 Memory Population by DIMM Bank 60  IBM z15 (8561) Technical Guide 11 960 10 10 0 0 0 768 512 12 1280 0 20 0 0 0 1024 768 13 1600 0 10 10 0 0 1536 1280 14 1920 0 0 20 0 0 2048 1792 15 3840 0 0 10 10 0 3072 2816 16 5120 0 0 0 20 0 4096 3840 17 7680 0 0 0 10 10 6144 5888 18 10240 0 0 0 0 20 8192 7936 19 480 15 0 0 0 0 384 128 CFG # Physical memory GB 32 GB #DIMMs 64 GB #DIMMs 128 GB #DIMMs 256 GB #DIMMs 512 GB #DIMMs -RAIM GB -HSA GB CFG # MD01-MD05 MD06-MD10 MD11-MD15 MD16-MD20 Physical Total -RAIM Total-  RAIM+HSA 10 32 32 32 32 640 512 256 11 64 32 32 64 960 768 512 12 64 64 64 64 1280 1024 768 13 128 64 64 128 1920 1536 1280 14 128 128 128 128 2560 2048 1792 15 256 128 128 256 3840 3072 2816 16 256 256 256 256 5120 4096 3840