Reveal came as the developer preview starts to roll out.
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One of the big "selling points" for Windows 11 was how the new operating system would be the "best ever for gaming." One of the big pieces of technology behind this idea was DirectStorage. In short, DirectStorage is a way to feed assets from a drive directly to the GPU without the CPU getting in the way and slowing the process down.

This would lead to faster load times, faster asset streaming, less pop-in, and other tasty benefits. This tech was announced as being exclusive to Windows 11, but it seems as though Microsoft is backing that up just a little bit.

The first DirectStorage Developer Preview started going out this past Friday and with it came word that those on the latest releases of Windows 10 will also get to use DirectStorage.

Microsoft is committed to ensuring that when game developers adopt a new API, they can reach as many gamers as possible. As such, games built against the DirectStorage SDK will be compatible with Windows 10, version 1909 and up; the same as the DirectX 12 Agility SDK.
So there you have it. If you're running a build of Windows 10 from roughly the past two years, you'll be fine. Of course, Microsoft says that Windows 11 will still hold additional benefits.

Additionally, because Windows 11 was built with DirectStorage in mind, games running on Windows 11 benefit further from new storage stack optimizations. The API runtime implementation and the GPU decompression technology is delivered via the DirectStorage SDK, and ships with your game.