The Xbox one and the Ps4 use a chip much like you see for the FM2 line of Amd cpu`s.
Where both the cpu and the Gpu are incorporated into the same die package Snowmare.
They do not have a separate cpu/ Gpu chip physically on both consoles.
But are both a custom made chip for each console based on a optimised Bonaire architecture
That were used in the 7800 series of Gpu`s from AMD/ATI.
So an RX 470 card, with a polaris Gpu on it for a Pc graphics card is much more powerful.
7800 series Gpu`s and graphics cards where first released in 2011 as Pc Gpu graphics cards.
That shows you in terms of graphics power and Gpu`s how far behind Consoles really are in relation to Pc based graphics cards and the Gpu`s they currently have.
Polaris...