I saw a RX 550 with 10 CU and 640 shader, and I thought itīs the unlocked version from the Polaris 12 gpu.

But itīs only a renamed Polaris 11/21 gpu with 6 locked cuīs and 1500MHz memory (called Baffin LE).

Another version of the RX560D, only with 10 CU.
I think this card is not good for mining, because the memory is to slow.