World of Warcraft uses DirectX 12 running on Windows 7 - DirectX Developer Blog

Today, with game patch 8.1.5 for World of Warcraft: Battle for Azeroth, Blizzard becomes the first game developer to use DirectX 12 for Windows 7! Now, Windows 7 WoW gamers can run the game using DirectX 12 and enjoy a framerate boost.

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Various] World of Warcraft Adopts DX12 but Gives up Fullscreen Exclusive Mode, Page 3