You will notice a difference mate when you upgrade your CPU.
Depends on the software. In BF4 or BF1 maxed out I might well see a difference at 1080p and a 60hz monitor . In Doom (especially in Vulcan) I probably wouldn't detect a difference because a Phenom II is enough to push the minimum framerate well above the monitor's refresh - and there is negligible to no improvement to be had from a better CPU.
Certain things bother me. Missing visual effects I know could be there does(and there are some cases where a fast CPU helps with physics or lighting). For running with a 30fps cap to get a consistent framerate when I know I could be running at 60 - well I know I could improve but I'd like to keep the money for now.
It would be different if I had a VR headset and dropping below 90 induced motion sickness but I don't (nor do I have any intention of buying into VR).
An upgrade will come - but it will either be when I want to play a game where I find the performance intolerable or I see such an outstanding CPU+motherboard bargain I just can't pass it up. My PC's been upgraded piece by piece since building it in 2003. That occasionally means there's a bit of a hardware mismatch - but it's the software and my own subjective preference on how it runs that dictates when I upgrade components - not because X will bottleneck Y.