Nvidia's currently the only GPU in town for DirectX 12 Ultimate

Overclock3D.Net | March 19, 2020, 3:15 a.m. | Original
Nvidia's RTX series are "Game Ready" for DX12 Ultimate.
The Stanley Parable and Watch Dogs are currently available for free on the Epic Games Store AMD confirms full DirectX 12 Ultimate support for RDNA 2 series graphics cards