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#dmidecode -t slot

System Slot Information

        Designation: PCIe Slot 3

        Type: x8 PCI Express 3 x16

        Current Usage: In Use

        Length: Long

        ID: 3

        Characteristics:

                3.3 V is provided

                PME signal is supported

        Bus Address: 0000:83:00.0

# lspci 

83:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10)

83:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme II BCM57810 10 Gigabit Ethernet (rev 10)

000:000:08.0 Bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 8.
000 --> Represents PCI Domain (Every PCI Domain could have 256 PCI Buses).
000 --> Bus
08  --> Device
0   --> Function