DXR which is sort of "software" version of fake RTX...

Rich people paid to beta test RTX but not many RTX were sold and not many games want to have RTX so they will give RTX for free now as a new drivers because they are afraid that RTX will die like many others technologies did.

There's no such thing as “hardware RTX”. It is all software based, just that Nvidia offers hardware tailored specifically to deal with these calculations — so it runs faster, but if powerful enough, then generic CPU, GPU what have you, can deal with it too. Performance will differ, but then it depends on what the calculations are.

Even “hardware” cannot trace every single ray in the scene (it is impossible, since there can be infinite rays, with infinite number of bounces), so it depends heavily on approximation and denoising. So, as I understand, generic hardware running the same software will need to rely on approximation / denoising heavier, that's all. Considering that most shadows are softened anyway, this may be good enough for shadow only or Global Illumination applications (as in Metro, Tomb Raider), and reflections depend on geometry, so can be limited to just tracing rays for the triangles, not for the whole scene. It is possible to further simplify these tasks and achieve a “good enough” result.

Dedicated specialized hardware is undeniably better, but it's not the only way.

nvidia™

Tempted to call that a fake subject; as far as I understand it, it was a known fact that AMD, having better compute performance, would be in about the same league whenever DXR became available, while not actively advertising a proprietary solution.

That is, unless you took at face value the cantankerous propaganda spewed by that CEO thing at nVidia.

DXR(DirectX Raytracking) is just API, for raytracking. It's not implementation and certainly not software one.

RTX is one implementation of it.

On 1000 series, Nvidia will just run it on Cuda cores instead. Still much faster than software.