Tom's Hardware Guide published a review on Ashes Of The Singularity Beta: Async Compute, Multi-Adapter & Power A quote from the article:

DirectX 12 has been available since Windows 10, but there aren't any games for it yet, so we're using the Ashes of the Singularity beta to examine DX12 performance.

 Ashes Of The Singularity Beta: Async Compute, Multi-Adapter & Power @ Toms Hardware