Well, the Maxwell cards will probably have better support for DX12 than Kepler cards, but how exactly remains to be seen. Maxwell cards also seem to profit a bit more than Kepler cards from Nvidia driver updates, so that's why normally I always recommend getting a 900 series card over a 700 series. The 770 Lightning however, really is a beast of a card, so that one might actually be an exception. Only thing to know is that it will use a LOT more power than a 960 for sure.