4k isn't even a thing with RT even on PC in far less complex games then ac odyssey. The only RT stuff u see is a shitty fake RT shader as mod in games that people run and even then performance is complete dog shit.
RT will probably be used when GPU is idling most of the time on those consoles in fighter games or less complex games with less stuff to render on the GPU front. But even then they probably want more performance for better complexity in the world. Because who's going to notice the lightning being a bit different nobody.
What jaguar cpu and slow hard drives do isn't interesting.
And Series X isn’t a bloated Windows 10 PC with all its processes and other apps running in the background using up compute.
Console - A single set of specs where developers code to the metal, no separate plug and play devices of which there can be a million different configurations like on PC.
They also have low level API’s, highly optimised middleware solutions which give additional performance on console vs PC and the Velocity engine on Series X (I’m sure they’ll be something similar in PS5).
Even ignoring the above, Series X has a roughly 17tflop GPU in comparison to the XB1X’s 6tflop GPU so it has almost 3x the compute performance of a GPU that already runs the current iteration of the Assassin’s Creed engine at roughly 2/3rd’s of full 2160p (1800p).
I will bet you $100 right now that AC Valhalla will run at native 4k/30fps on Series X if Ray Tracing is enabled (probably reflections and ambient occlusion although I wouldn’t rule out GI too).
If it doesn’t have any form of Ray Tracing then it will be dynamic 2160p/60fps. Yes, yes I know the shitty farmed our port of Odyssey runs like crap on PC so needs to be brute forced to 60.
In short, Series X is in no way, shape or form a Windows 10 PC and it’s absolutely stupidly powerful for a console, especially in comparison to the consoles when they launched in 2013 with their low end laptop CPU/GPU combo. Comparing it to a PC is pointless.
Some people need to leave their ego at the door and realise consoles are about to be on par with high end gaming rigs where they will offer either Dynamic 4k/60fps or Native 4k/30fps with RT.
Once we have a built form the ground up next gen AC game then things might change. Until then we have a 17tflop console running a game built around the constraints of a 1.3tflop XB1S...
I didn’t get into the CPU because both consoles have a CPU which is a 500% increase over current gen. Their storage devices are roughly 40x faster on Series X, 100x faster on PS5 too...