The PA-5400 Series Data Processor Card (DPC) is a front slot card that improves the processing capacity of the PA-5450 firewall. You can install up to four or five DPCs depending on your scaling needs and slot configuration. A DPC can be installed in slots 2 through 6; however, slot 2 may also be used for the installation of a Networking Card (NC). See PA-5400 Series Firewall Networking Card (NC) for more information.