The magic essentially works because they're feeding lots of hidden information in for the upscale - the 1080p is being constructed from a bunch of 720p frames +

The magic essentially works because they're feeding lots of hidden information in for the upscale - the 1080p is being constructed from a bunch of 720p frames + depth/motion vectors, etc. So it's natural that it is able to look better, and they wisely tap into the (mostly/entirely unused in games) tensor units on the GPU to do it without eating too much into your shader performance.