Consideration for PCHID identification: 2.5 Memory Note:  The CHPID Mapping Tool (available on ResourceLink) can be used to print a CHPID  Report that displays the drawer and PCHID/CHPID layout. In previous PCIe I/O drawers (introduced with zEC12), the orientation of the I/O features were  vertical. For z15, the orientation of the PCIe features is horizontal, and the top of the card is  now closest to the center of the drawer for the left and right side of the drawer. The vertical card collapsed horizontal and the awareness of the port and PCHID layout where  the top of the adapter (port D1) is closest to the location panel on both sides of the drawer are  shown in Figure 2-20. The maximum physical memory size is directly related to the number of CPC drawers in the  system. Each CPC drawer can contain up to 8 TB of customer memory, for a total of 40 TB of  memory per system. The minimum and maximum memory sizes that you can order for each z15 feature are listed  in Table 2-4. Table 2-4 Purchased Memory (Memory available for assignment to LPARs) 56  IBM z15 (8561) Technical Guide Figure 2-20 I/O feature orientation in PCIe I/O drawer (rear view) Feature # of CPC drawers Customer memory GB Flexible memory GB Max34 1 512 - 7936 NA Max71 2 512 - 16128 512 - 7936 Max108 3 512 - 24320 512 - 16128 Max145 4 512 - 32512 512 - 24320