Nvidia, AMD Cross-SLI Tested In DirectX 12 Ashes Of The Singularity - DX12 Explicit Multi-Adapter In Action
Ashes of the Singularity: Unlinked Explicit Multi-Adapter w/AFR & The Test - GeForce + Radeon: Previewing DirectX 12 Multi-Adapter with Ashes of the Singularity
DirectX 12 update brings Explicit Multi Adapter support so GPUs work better together - OnMSFT.com