Your CPU is pretty good to game. What I would do if you want to play more demanding games is to upgrade your RAM, you can do this by looking for the exact same 8gb stick you already have or by buying a new 16gb DDR3 kit. You will also need a new GPU it depends on your budget but a gtx 1060 6GB is a pretty good card and isn't really expensive. For the PSU, if it is a bronze rated PSU from corsair I wouldn't change it. The 600W will be enough. For the SSD, you don't really need one, although it would greatly decrease your boot up time and load times, but I don't think that you need a 500gb one. If it's just to put your OS and a couple of games a 250gb or even a 120gb SSD will do the job. Sorry for the long answer, but I hope that I could help.