Hi,
I upgraded my GPU a while ago to a 1070 from my original build where all my parts where quite evenly matched. I didn't have the funds to upgrade both my CPU and my GPU at the time, so my i5 4460 has just been bottlenecking it ever since (in some CPU intensive games like hitman, the GPU was sitting at only 50% while the CPU at 100%). I'm now looking to upgrade my CPU to something like an i7 4790 or 4790k (but my motherboard can't overclock anyway). The reason for me not upgrading to a newer generation like Kaby Lake or Coffee Lake, is because this would mean I would have to upgrade my RAM to DDR4 and my Motherboard which would cost much more, and i probably couldn't afford it. Would the upgrade to either of these processors eliminate the bottleneck? Or at least decrease it? And by how much? Would the upgrade be worth the money? (I would probably get the CPU second-hand).