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Does UE4 support DX9? What about ?
UE4 does not currently support DX9 or . We plan to use OpenGL to run on in the future. Most of our features are supported on OpenGL3 as you can see on Mac OSX today and we have been working with NVIDIA to support our full feature set on OpenGL4.
** Will UE4 support DX12?**
Yes. Epic will be working closely with NVIDIA and Microsoft to create a world-class implementation of DX12 in Unreal Engine 4.
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This was the official post, right on the first page. You (the OP) said you were just waiting for an official answer, well here it is.