DirectX is the secret sauce that allows most of the best PC games to run. It solves a problem for developers by offering a standardized solution to communicate instructions to your graphics card, and it’s a cornerstone of the best graphics cards you can buy right now.
We’ll run you through what DirectX is, why DirectX 12 Ultimate is important, and how you can find what DirectX version is installed on your PC.
What is DirectX?
DirectX is an application programming interface (API) developed by Microsoft for Windows and Xbox. A graphics API is a middleman that facilitates sending instructions from software to the hardware inside your PC. In the early days of computers, instructions went straight to the hardware. However, as games have become more complicated and security measures more direct, APIs have been the backbone of telling your GPU what to do.
In years past, game developers would need to write drivers for multiple graphics cards. APIs like DirectX are standardized, which allows your AMD or Nvidia drivers to do everything regardless of what graphics card you have. Graphics APIs also enable features like hardware-accelerated ray tracing, and they can boost performance through various optimizations.
DirectX isn’t the only graphics API, but it’s the main one you’ll encounter. It’s exclusive to Windows, however, while open-source APIs like Vulkan provide cross-platform support.
DirectX 12 Ultimate explained
The most recent version of DirectX is DirectX 12 Ultimate, which is available on Windows 10, Windows 11, and Xbox Series X/S. Microsoft describes it as “additive” to DirectX 12, bringing features like ray tracing and variable rate shading to Windows and Xbox consoles.
Here are all of the additional features in DirectX 12 Ultimate:
- DirectX ray tracing (DXR): An early version of ray tracing introduced in games like Fortnite and Battlefield V. Most titles that support ray tracing do so through DXR (though Vulkan has its own ray tracing support, as well).
- Variable rate shading (VRS): Allows the GPU to allocate different amounts of power to different areas in a frame. The idea is to boost performance by focusing on the most important areas of a scene, which saves resources in less demanding areas.
- Mesh shaders: Mesh shaders are a complex topic, but they essentially combine multiple shader steps into a single process. This avoids passing between your CPU and RAM when drawing meshes, which improves performance.
- Sampler feedback: Modern games stream assets into the game world, and the game is forced to predict what to stream next based on what the player is doing. Sampler feedback feeds samples of what could happen without actually executing the instruction, allowing games to make better decisions about what assets to stream in.
Although DirectX 12 Ultimate has many new features, you don’t need to worry about them. They’re mainly for developers to optimize games beyond what they could do in DirectX 12 or DirectX 11. The most important addition is DXR, which enables ray tracing not only on PC but on the Xbox Series X, as well.
DirectX 12 vs. DirectX 11
Although most new games ship with DirectX 12, there are still many prevalent titles that use DirectX 11 by default. Fortnite, for example, uses DirectX 11, and games like Control and Civilization VI include both options. In most cases, you should choose the most recent API supported by your graphics card.
We went through the benchmark in Tiny Tina’s Wonderlands to see the differences. They’re minor, but DirectX 12 provided a respectable 6.5% increase in our testing. The most recent DirectX version will generally provide the best performance, especially months or years after a new version has launched.
Nvidia’s RTX 30-series and 20-series graphics cards support DirectX 12 Ultimate, as do AMD’s RX 6000 graphics cards. AMD’s RX 5000 graphics cards don’t support DirectX 12 Ultimate (they don’t support ray tracing), though they support the base version of DirectX 12.
How to install and update DirectX
You can’t install DirectX directly. It comes with Windows, and you can only update it with Windows. If you see an offer to install DirectX online, avoid it at all costs. Microsoft doesn’t make any installers available.
Installing and updating DirectX involves performing a Windows Update. Read our full guide on how to install Windows 11 if you’re starting from scratch. Before updating DirectX, you need to figure out your DirectX version, which you can do by following these steps:
- Right-click on the Windows icon in the Start bar and select Run.
- Type “dxdiag” into the box and select OK.
- Check for DirectX version under the System tab.
As long as you’ve kept Windows up to date, you should have the latest version. If you don’t, you can force Windows to check for new updates with the following steps:
- Use Windows Key+S to pull up the search box.
- Search for Check for updates and select it.
- Use the Check for updates button to search for new updates.
- Click Install now.
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