@PLASTICA-MAN, VXGI looks under dev, so DFGI, but one is a hardware solution, one is software. If I would be a decision maker at Epic, I would probable stop development efforts of current dynamic GI , keep only Lightmass and focus on VXGI only. If nVidia started this way, AMD and Intel will be forced to adopt it or come with something similar.
@darthviper107, possible to work on GTX 660, but is marketing also, that new feature can be a major selling point for new cards.