Upgrade from 10900k to 9800X3D

[tekken3600]

Hi all.
I would like to upgrade the CPU of my RIG.

Currently, I have an Intel Core i9 10900k and a RTX 4090 GPU. I play games at 4K. Mostly I get 85-100 FPS in every AAA games everything is set at maximum settings. My goal is to reach 4K 120FPS.
My potentional candidate is an AMD Ryzen 7 9800X3D.
My question is, is it worth upgrading my CPU to the above mentioned one. Will I get 4K 120 FPS by buying this CPU?
Thank you for your answers in advance.

 

[Colif]

I would expect you get between 120 and 200FPS with that combo
but it depends on the games really

 

[Zed Clampet]

Hi all.
I would like to upgrade the CPU of my RIG.

Currently, I have an Intel Core i9 10900k and a RTX 4090 GPU. I play games at 4K. Mostly I get 85-100 FPS in every AAA games everything is set at maximum settings. My goal is to reach 4K 120FPS.
My potentional candidate is an AMD Ryzen 7 9800X3D.
My question is, is it worth upgrading my CPU to the above mentioned one. Will I get 4K 120 FPS by buying this CPU?
Thank you for your answers in advance.

Really need to know what games you are playing. Some are more CPU intensive than others. I assume you've tested in your games what is slowing you down? Or are you just assuming it's the CPU?