A quick update, about 3 weeks ago I put a 7600k in this system along with a second monitor, 1440p 144hz display. The 7600k @4.9ghz gives cinebench CPU: 711 openGL 111fps I had a few background task's running but that's a general idea of the difference, same OS same programs just extra desktop space.
edit: The reason I ditched the g4560 is because both 7th gen non-k cpu's and z270 motherboards will not allow more than a 3% OC. Otherwise I would have swapped it for my mom's I3 6100k.