well for that price if you can build a pc around those two specs then you are doing pretty good. what kind of perf will you generally get with those specs in most games? you will definitely be able to play most games with those specs (especially cs:go) at medium to high levels without issue. some games will scale better than others but with that cpu and gpu you would really only run into problems on games like witcher 3 and metro last light, games that are on the cutting edge graphically.