Thanks bro!Depends on the games but in general your not really going to bottleneck with the 4790K especially if you have it overclocked that is still a strong gaming processor.
Comes more down to your monitors refresh rate and how demanding the games are along with the in game settings.
I would go up to a 2070 Super without stressing over it. For a 1080p monitor with just a 60 refresh rate a 2060 Super would be fine should max most games out.
I just upgraded my 4790K to a 10600K so I could pass my 4790K down to my son to replace his old 2500K. They were no games that gave me any problems at all and only had it overclocked to 4.6.Thanks bro!