Yes you are right , but:
5 V 1.2 A it is what - 6 W
with 6 W with theoretical specs current 16 nm generation of Bitfury you will get roughly 50-60 Ghs tops and the chip will be hot as hell, so the device will need good coiling - heat sink alone will have trouble to handle the heat or it have to be oversize .
This is my reason