Here's something weird. According to one of the more reliable leakers...
XSX
Front-End:
RDNA 1
Render-Back-Ends:
RDNA 2
Compute Units:
RDNA1
RT:
RDNA2
XSX
Front-End:
RDNA 1
Render-Back-Ends:
RDNA 2
Compute Units:
RDNA1
RT:
RDNA2
— Elysian Realm (@KittyYYuko) October 16, 2020
Now DF did mention on their Hot Chips that RDNA 2 chip in the Series X did have some resemblance to RDNA 1 such as the Compute Units. I'll be interested to see whether or not the Ps5 has a similar configuration and more importantly... Whether or not Big Navi does. Take it with a grain of salt of course.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850