In games like CS:GO i have solid fps,than suddenly i get a FPS drop,it drops under 40,than my CPU is cooling down,but my fps stays the same,untill i restart and wait like 15-20 minutes.This happens at random moments.The CPU is AMD Phenom II X4 955 3.20GHz,when i check the temps after the thing happens the readings are 255 degreees celsius,which is impossible.
Proof http://imgur.com/a/zbiYJ
Proof http://imgur.com/a/zbiYJ