Chapter 8 Hardware Acceleration : Hardware acceleration overview : Network processors (NP1, NP2, NP3, NP4 and NP6) : Determining the network processors installed on your FortiGate unit
  
Determining the network processors installed on your FortiGate unit
Use the following command to list the NP6 processors in your FortiGate unit:
diagnose npu np6 port-list
To list other network processors on your FortiGate unit, use the following CLI command.
get hardware npu <model> list
<model> can be legacy, np1, np2 or np4.
The output lists the interfaces that have the specified processor. For example, for a FortiGate-5001B:
get hardware npu np4 list
ID    Model         Slot       Interface
0     On-board                 port1 port2 port3 port4
                               fabric1 base1 npu0-vlink0 npu0-vlink1
1     On-board                 port5 port6 port7 port8
                               fabric2 base2 npu1-vlink0 npu1-vlink1
The npu0-vlink0, npu1-vlink1 etc interfaces are used for accelerating inter-VDOM links.