You can't use 2666 and 3200 together. Just get a stick of 3200 or 3600 since its MUCH better value and 16gb 3200mhz is only 90 euro which is super cheap these days. You will get about 50-100fps increase with your current setup. Also I would suggest the NEW Ryzen 3300x that was just released a few weeks ago and its priced at just 120 euro, the best budget CPU for gaming. it's 40% faster in single core and 90% ish in multi core than your current CPU. Also I would recommend a 1660 super for budget. If you follow my advice you will have a pretty fine budget PC.