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For a start, here's how to lookup your Motherboard's information in Terminal:

sudo dmidecode -t 2

GPU:

[root@localhost ~]# dmidecode -t 9 | egrep "Bus Address:|Designation:"

        Designation: CPU1_Slot1

        Bus Address: 0000:02:00.0

        Designation: CPU2_Slot2

        Bus Address: 0000:ff:00.0

        Designation: CPU1_Slot3

        Bus Address: 0000:03:00.0

        Designation: CPU2_Slot4

        Bus Address: 0000:ff:00.0

        Designation: CPU2_Slot5

        Bus Address: 0000:81:00.0

        Designation: PCH_Slot6

        Bus Address: 0000:07:00.0

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