8f you can wait for 15th gen do it. Since 15th gen going to be on 7nm and it will be a big boost in performance.

That’s a big jump.

9600k is 6 core without ht and it stutters a lot. I shifted from the same to 5800x and it was a big difference. 8 core/16 threads brings smoothness. 6 threads is just too limited there.

However at 4k, the average fps will change very little however the smoothness of gameplay will change a lot.