Sorry but what? I've run a 960 2GB card for the past few months and with realistic settings games have run fine. Battlefield 4, Battlefront, Project Cars, etc..
Whether the 1060 has 4GB or 6GB, it doesn't matter. Hell it could have 2GB still and it would still play games.
Whether the 1060 has 4GB or 6GB, it doesn't matter. Hell it could have 2GB still and it would still play games.