Nvidia made the GTX 1060 3GB card official this morning. As the rumor mill suggested, this card will have one of its SMs disabled, bringing the total number of stream processors on board the chip down to 1152. The card will also have eight fewer texture units, for a total of 72. In exchange for those cuts, Nvidia has set the GTX 1060 3GB card's suggested price at $199.
Everything else about the card, including its 1506-MHz base and 1708-MHz boost speeds, is identical to the specs of its 6GB sibling. Nvidia doesn't appear to be releasing a Founders Edition version of the 3GB card, but MSI and EVGA are already taking up the slack with GTX 1060 3GB lineups that range from mild to wild. If stock of the 3GB card is plentiful and the resource cuts don't hurt the lesser 1060 that much, AMD may have reason to worry if it can't begin to meet the demand for the perpetually-out-of-stock Radeon RX 480 4GB card. We'll have to see how that situation shakes out over the next couple weeks.