I have RX 470 and i5 3330 with 8 GBs of RAM.I have some issues while playing Battlefield 1 in 1080P Ultra details.Especially in 64 players map.I am thinking about CPU upgrade,I have two option due to my budget.i7 3770K which is compatible with my current motherboard(Z77 platform,which means I will be able to overclock the 3770K) and i5 6500 or 6600 with new motherboard,and RAM.In my country there are 130-160 dollars of gap between these two option,upgrading to Skylake is more expensive for my budget.What can you suggest?I am okay with spending more money if the difference between stock 3770K and 6500/6600 is significant.