Roughly 35% to 40% more potential gains here so yes the i5 3570k will definitely start to bottleneck higher GPU's like Gtx 1080 ti, Radeon Rx Vega etc at 1080p & 1440p but i doubt at 4k other than maybe helping with mins....i would upgrade!
Windows 10
i5
[email protected]
16GB DDR3 1800mhz
R9 Fury 4GB@1000mhz
Windows 10
i7 7700k@Stock 4.5ghz
16GB DDR4 3000mhz
R9 Fury 4GB@1000mhz