The 4790k wouldn’t be much of an improvement over the 4770k especially since you said you have it OC’d.
PUBG isn’t multithreaded very well and prefers faster cores over more cores so the 9700k would give you a decent performance boost but right now intel is being hurt by AMD and everyone is waiting to see what Zen 2 will force them to do.
So I’d wait. Intel is just releasing CPU’s with more and more cores on what is pretty much the same architecture they’ve been using for a few years now. Hopefully Zen 2 will force them to make a big jump in performance. If not then Zen 2 will likely be the way to go.
I would either wait to upgrade your hardware or upgrade your display. In my opinion 1440p is really the sweet spot for PC games. The...