I have R7 260x and i3 4130 too but 8GB ram. You can play far cry 4 evil within battlefield 4 on medium settings at 1080p with at least 50-60 frames and 30-40frames at high settings.. and yes with AA enabled, just FXAA. You can play at high settings with older games at 70+ fps @1080p and 30-40fps at ultra settings. Your setup is good and can handle games well with smooth frames at 1080p. How much more at 720p? Just get 8GB ram.
By the way if you have extra money get a GTX 750ti. R7 260x has a lot of problem like BSOD, instability and bad drivers. Trust me, a lot of people have problems with it.