So I got a pretty good deal on a computer off of craiglist (sketchy I know) but it was only 50 bucks and had a 250g solid state drive and 8g of ram. So I already upgraded to a nvidia 650 ti and its running games decently enough but struggles a bit with PUBG. My processor isn't meeting the minimum requirements so I am wanting to upgrade that but I'm honestly not sure what I need. I don't know a whole lot when it comes to computers but I believe I have a LGA 755 socket on my motherboard. What are some upgrades I could use? I'm already planning on upgrading my PSU but wanna start with the CPU first. Thanks in advance.