What DirectX version does Ace Combat 8 require?
DirectX 12 is listed in the official minimum PC requirements.
Confirmed explanation
Steam also specifies Shader Model 6.6 or higher and a hardware-ray-tracing-capable graphics card. An operating system or GPU supporting some DirectX 12 features may still miss the complete baseline.
What is not confirmed yet
Required feature level, driver version and optional rendering APIs are not stated.