The funniest part, I can confirm, because I'm running one, is that 10 years later, for gaming, it's not useful to upgrade from a i7 2600K (mine running at 4.0Ghz, but can go up to 4.5Ghz if needed be) to a 10y younger CPU, just because of gaming, as it is good enough to pull 60+FPS (and many times around 80-100FPS) in the games I play in 1080p (many at 60 fps even in my old setup of 3840x1024 = 3 1280x1024 monitors)
They're a mix of Tomb Raider, Witcher, Assassin's Creed series up to Odissey, W.Warcraft, and other Steam MMO and Single games, Destiny2, Star Wars games.
Mine is paired atm w/a GTX 1060 6GB (best partner for it as both are pushed to the limit around the same load). The only game I've seen this combo struggle is with MS Flight Simulator.
And it's also good enough for daily use, browsing, running VirtualBox and Bluestack machines and all other kind of stuff, except may be rendering and hyper specific video tooling.
So no need to upgrade, people. Stick to your 10y CPU, it's good enough, and go spend your money elsewhere. Travelling...