I don't think you did a damn thing prior and as you stand now you won't gain anything either. Blunt, but true.
Your i7 4670K will carry through the next set of games just fine. When you game, you focus more on the GPU that pumps your screen pixels. If you're keeping the same screen(s), then you should be fine with the next game you want to install. When your GPU's fail to do this, then your CPU starts taking a hit. This is still a basic truth. As a gamer you'd be better off putting money in some bigger and better screens before asking what do I drive these with? When it comes to 2600K screens, CPU's like you have aren't the issue.
I'm running some AMD 290's for my little 24" screens and a lowly 3550p CPU. I feel CPU's are the bottom of the discussion when it comes to games. Talk about screens, GPU's, the games you play, and then slightly mention CPU. Spend your money wisely on the PC or join the consoles.