Hi. I currently have an FX-6300 which bottlenecks my GTX Zotac 750Ti in BF1. I plan to upgrade to a GTX 1080. Having only reently learned about botlenecks, i had no idea it would be a problem. What is the minimum of a CPU that i should pair with a GTX 1080? and how much should i expect to spend? Would it be okay to get the CPU second hand?