Ray Reconstruction is the latest graphics feature from Nvidia and it's come baked into DLSS 3.5. Like Frame Generation it is a separate toggle from DLSS, but unlike Frame Generation it's open to every RTX graphics card from the 20-series onwards.
And it's rather stunning. I've already spoken about the difference Ray Reconstruction can make to the level of realism in Cyberpunk 2077, and about the fact that it can actually deliver higher frame rates, too—but only if you're already sporting a high-end Nvidia GPU. At its most basic Ray Reconstruction removes the standard denoisers from the graphics pipeline—hence the extra performance from removing a step—and instead utilises AI to denoise a scene around the same time the Super Sampling stage is engaged.
It's more realistic, gets rid of a host of temporal glitches with ray tracing, and looks glorious.
Though there are still some caveats in that you do still need to be running DLSS to actually enable it and, for Cyberpunk 2077 at least, you also need to be running the path tracing RT Overdrive mode for the option to be available to select.
That alone will put most non-RTX 40-series cards out of the performance picture anyway, even if they are nominally eligible to enable the feature. I can't imagine an RTX 2060 coping particularly well with the rigours of a path-traced Night City.
If you have a card capable of playing the game at an acceptable frame rate with the RT Overdrive mode, then enabling Ray Reconstruction is a must. You either just get a better-looking game or a faster one, too.