Mobile GPU AMD Radeon RX 500 are renamed models RX series 400
At CES 2017 partners AMD showed the new mobile PCs that use the 3D-card series Radeon 500. For example, in the configuration of the laptop Lenovo Y520 comes with Legion Radeon RX 560M, and the Samsung notebook Odyssey — RX GeForce 570 with 8 GB of memory.
One of the sources managed to learn from the representative of AMD that Radeon RX 570 is essentially a renamed model GeForce 470 RX, intended for the supply channels OEM. Moreover, this is true in all models of the RX series 500.
Sources: WCCFtech.com, Reddit