Stoney Ridge is a ~125mm² die, but I'm not certain if there will be harvested Carrizo / Bristol Ridges used for some of "Stoney" models.
AMD seems to be using the harvested dies for their embedded products.
Harvested Carrizo/Bristol Ridge dies -> I-family. Based on the fact it uses 4 CU igpu.
Harvested Stoney ridge dies --> J-family