Microsoft DirectX 12 is DirectX 11 with Mantle Integrated

Sources have revealed that Direct X 12 is basically DirectX 11 with Mantle absorbed, the performance increase on Xbox One is in doubt.

Fortnite DirectX 11 vs DirectX 12 Comparison (Radeon RX 5700 XT

News - AMD Details DirectX 12 Multi-GPU And Shared Memory

DirectX 11 and DirectX 12: Which One is Better?

DICE Posts its Own Battlefield 4 DirectX vs. Mantle Performance

What is Vulkan and DirectX and how They Affect Video Games

Microsoft Announces DirectX 12: Low Level Graphics Programming

The DirectX 12 Multiadapter Concept Isn't Really New - PC

News - AMD Details DirectX 12 Multi-GPU And Shared Memory

Best Alternatives to DirectX - Download DirectX App for Free