@ken_8677
It's the difference between support and feature level. Those are the terms you need to keep separate.
DirectX is a set of "application programming interfaces" (APIs), now at version 12. Think of it as a language. If a GPU can speak the language, it has DirectX 12 support.
The problem is that it may not be able to execute all the functions specified in the DirectX 12 APIs. That is the feature level, what the GPU can do. So a GPU may have DirectX 12 support, but only feature level 11. And that does not satisfy Photoshop's current requirements.
If you look at the spec sheet of any GPU, the feature level is always specified. But it's usually in small type a bit down, because it can be lower than the "support" level.
If you buy a new GPU now, this is not an issue. Any half-decent GPU now will have feature level 12. But if you get an older one, like 6-7-8 years old, this is something you need to check.
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