My friend got a new pc and after one month of useg he said to me that his cpu is overheating on idle 60c and when playing league of legends ~80-90 so i told him to buy a new cpu cooler so he got a thermaltake contac 21 and his cpu teps where better but still not good idle ~50 and ~70 max 80 what can be the problem pls help cpu is a amd athlon x4 870k 8 gb ram and a rx 460 2 gb dual oc win10 64bit