Are you using a vmxnet3 vNIC on the VM? This is perfectly normal as the hardware the guest sees is completely abstracted from whatever physical your host has and the generic virtual device is not related to the physical NICs. You could have a 10Mbit BNC physical connection, or a WLAN adapter for that matter, and the guest would still always see a 10GbE virtual Ethernet NIC. So don't worry about that, this is perfectly fine.
The only way you would be able to really pass physical properties of a device to a VM would be via vmdirectpath passthru, which presents the physical PCI(e) device directly to the guest but that is something very unusual which generally makes no sense in 99% of environments.