The much larger factor is the clock speed especially the boost clocks. Now what everyone is waiting to see is how they manage to pull this off. The rumor is the cores that can do the high boost do not have the 3d memory where all the cores on the 7800 have 3d memory.
So now how does the OS or whatever know what application need cores with the memory and which do better with the higher clock. Almost going to need some menu that lets the user define this.
The 7900x3d is only $50 more than the 7900x but the 7900x sells for much less than MSRP
You clearly have no clue what you are talking about. ALL CORES HAVE 3D MEMORY. Thats the point of these chips.