Comment # 51 on bug 1007695 from Michal Marek

So there indeed are two Ethernet type devices with Type instance 1.

Handle 0x008D, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Intel 82579LM VPRO
    Type: Ethernet
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:00:19.0

Handle 0x008E, DMI type 41, 11 bytes
Onboard Device
    Reference Designation: Intel 82574L
    Type: Ethernet
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:02:00.0

IMO the smbios data is bogus.