"So a few things, the 4790k isn't gonna do much for you. For Witcher 3 hats actually really good performance, are you running a 144hz monitor? if not you won't even notice a difference in performance if you upgraded. Other than watching the fps meter do you notice these drops? I bet not.
The only way you will get better performance is if you really re-do everything (i7-6700k at a minimum), but even then unless you're running a 144hz monitor why bother."
First, thanks for the reply! However I don't know if that's correct. I'd love to believe that but the info I've read on the subject from an i5 to an i7 with a GTX 1080 is a big deal. Witcher 3 at 1080p should (according to aggregated benchmarks) be around 110 fps average. While mine sits around 80-90. As said in Novigrad and Villages it definitely drops in performance, the fps drops I can definitely notice, no doubt about that. It's mainly the fact that I'm not getting the type of performance I believe I should be. Once again that is based on aggregation of benchmarks and reviews of the card.
However, when I pair it up to an i5 with a 1080 it is about on par, with suffering usage in the GPU, and high CPU usage with a decently large shrink in frame rate. I think you're right in a sense it's not gonna be a huge huge increase. But I think it will deliver the performance i was expecting which is at minimum a constant 60 fps Ultra on at least 1080p. Currently that is not what I'm getting.
When I've talked to Nvidia and EVGA, and Reddit about it... Most have claimed its a CPU related issue due to the usage being so high in my GPU usage being very low. As well as a lower frame rate and slight stuttering.