Are 1000-Mbps network adapters supported on virtual machines?
The device sharing model in Hyper-V does not expose the physical network adapter of the server running Hyper-V to the virtual machine. The virtual machine can use a network adapter optimized for use in virtual machines, or a legacy Intel/DEC 21140 adapter (depending on the virtual machine configuration setting). If the version of Windows on the server running Hyper-V supports a physical network adapter, you can create a virtual network switch for the virtual machines to use.