Topic on Talk:WRC 9: FIA World Rally Championship
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Checked it too. Only DX11.
Found a(bout) 4 Year old Reddit Thread about it : https://www.reddit.com/r/WRCTheGame/comments/jkwpwn/rivatuner_reports_wrc9_game_only_runs_in_dx11/
Looks like DX12 wont work since release.