What Is DirectX and Vulkan? Graphics APIs Explained for Gamers

What Is a Graphics API?

A graphics API (Application Programming Interface) is a set of tools and functions that developers use to communicate with the GPU. Instead of writing code specific to each GPU model, developers write to an API and the GPU driver translates that into hardware instructions.

DirectX

DirectX is Microsoft's collection of APIs for Windows gaming. The graphics portion is called Direct3D:

• DirectX 11 (DX11): Stable, widely supported, runs on almost any GPU made since 2009
• DirectX 12 (DX12): Low-level API giving developers more direct hardware control; better multi-core CPU scaling; supports ray tracing, mesh shaders, and variable rate shading
• DirectX 12 Ultimate: DX12 with the full modern feature set (ray tracing, mesh shaders, sampler feedback)

Vulkan

Vulkan is an open-standard, low-level API developed by the Khronos Group. Like DX12, it gives developers direct hardware access for better CPU efficiency. Vulkan is cross-platform — the same code runs on Windows, Linux, and Android. Games using Vulkan: Doom Eternal, Red Dead Redemption 2, Baldur's Gate 3, Cyberpunk 2077, Minecraft.

Which Should You Use?

This is a per-game choice:

• DX11: Most stable, best compatibility, sometimes better performance on older hardware
• DX12/Vulkan: Better performance on modern multi-core CPUs, required for ray tracing in many titles

Some games run better on DX11 despite supporting DX12 due to suboptimal DX12 implementations. The MrGameFix knowledge base covers game-specific API recommendations.

OpenGL

OpenGL is an older cross-platform API still used in some games (Minecraft Java Edition historically used OpenGL). It has been largely superseded by Vulkan.