Native dxdiag is checking the name of the display driver which in our case winex11.drv and I guess this is just the identifier of Winex11.drv. Inside winex11.drv we don't really have the knowledge about the 3d hardware we are emulating. In the end we might need to duplicate some card detection code inside winex11.drv and show a real driver name like the Nvidia or ATI ones. It would be a lot of work and only be worth if apps really need it.