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## Consideration for PCHID identification: 

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. 

<img src='content_image/982410.jpg'>

Note:  The CHPID Mapping Tool (available on ResourceLink) can be used to print a CHPID Report that displays the drawer and PCHID/CHPID layout. 

## 2.5 Memory 

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. 

<img src='content_image/982411.jpg'>

