Did Microsoft Put Secret Sauce in Xbox One? DX12 May Allow Xbox One To Save GPU Time, Render Ray Tracing, SuperFog And Custom Effects

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According to developers the X1 already uses a Mantle-like interface allowing direct hardware access and not Direct X. DX12 is only relevant for PC gaming by porting over things that are already available on X1. The X1 will not benefit because it already has all the direct hardware access features of DX12.