DirectX 12 vs DirectX 11 Performance Slides

Windows 10 will be coming with DirectX 12.  DirectX 12 is the first version of DirectX that really uses multiple cores effectively. Bottom line: In DirectX 11 this frame took almost 9ms to render. 

Developing DirectX® applications - AMD GPUOpen

DX12 CPU Performance Leaked, Way Faster Than DX11 - Threading

DirectX 11 vs DirectX 12: Complete Performance Comparison

Unity - Manual: Audio Source

DirectX 12 vs. DirectX 11: which is better for PC gaming

Intel Graphics Announces DirectX 11 Performance Uplifts and Frame

OpenGL - Wikipedia

Windows 11 review

Asus M4A89GTD Pro/USB3 Motherboard Review: AMD's 890GX Chipset