If your eGPU device works fine in macOS, Parallels Desktop will use the
available graphics resources to increase virtual machine video performance.

• It is not possible to connect an eGPU device directly to VM, as they
are being connected to Mac via PCIe interface which requires VT-d
technology support to make virtualization of such connection possible,
but VT-d on Mac can't be used for passing an external GPU to a virtual
machine.