@Has_Neyn
Well, in Witcher 3 the GTX 660 is listed as minimum requirement. I am not sure what settings and how much fps it'll allow at this point, I think medium settings should be fine to be able to run it with decent frames per second.
It's hard to say anything for CP2077 until the official share of the requirements.
But since the Red Engine is enhanced and ray tracing added, and the whole world being loaded only once, there may be a demand for a higher tier setup than Witcher 3 required, even for minimum specs.
However, CDPR proved that they can handle optimization very very well, and I am confident that it'll still run on most machines at least with low or medium settings for older setups.