I will say I had an issue with GTA and windows using 7.8gb of my RAM, so I now have 16gb, but I know a few people who are getting much lower RAM usage, if you are playing and everything is running smoothly, then you are fine, but like it says above me, just open task manager and game for a bit, then tab out and look at the memory usage chart, unless that tops out then you shouldn't need to upgrade, and for the peripherals, wireless isn't a good idea with gaming unless you only spend a short time each session, again, I have done 14-16 hour game nights on SWTOR, 8 hours on rust, 12 hours plus on GTA, so that will kill the batteries, so get a wired set up, mechanical is more of a preference than a must, I personally don't like them and got an APEX from steel series, find a shop and have a play and find what you like