Deus Ex: Mankind Divided – Patch v1.4 build 545.4_P6 Changelog:

Fixed a DirectX 12 crash at start-up.
Reduced DirectX 12 CPU usage for better performance.
Slightly reduced system memory usage.


In order to access the game’s DX12 API, you’ll have to follow this guide:

Within your Steam Library, right-click on Deus Ex: Mankind Divided.
Select ‘properties’ from the context menu and navigate to the Beta tab.
From the dropdown menu, select dx12_preview then close the window.
Once the DX12 has been downloaded, select DX12 from either the launcher window or from the Display options within the game.