The impossible has happened: Testing Radeon and GeForce together in DirectX 12
DirectX 12 will be able to use your integrated GPU to improve performance | PC Gamer
DirectX 12 tested: An early win for AMD and disappointment for Nvidia | Ars Technica
DirectX 12 Explicit Multi-GPU Performance Review with Ashes of the Singularity | DirectX 12 Explicit Multi-GPU Performance Review with Ashes of the Singularity | GPU & Displays | OC3D Review
DirectX 12 Multi-GPU Performance - Ashes of the Singularity Revisited: A Beta Look at DirectX 12 & Asynchronous Shading
Rise of the Tomb Raider new patch added DirectX 12 Multi-GPU and Asynchronous Compute