A few days ago I was playing Payday2. Towards the end of the game i realised my game becoming extremely choppy, I investigated and saw that in Msi Afterburner cpu temp was 100 degrees celcius i-5 4690k (not overclocked). I decided that i would close down Payday 2 and wait to see if it would decrease. I waited about 2 hours and the temperature was idling around 50 degrees celcius. I decided that i would turn off my pc and re-seat the cpu cooler. I turned my pc back on to see the temps were at 100 degrees celcius until after 20 minutes it returned back to 50 degrees. I decided that it was probably a software issue, I formatted my hd and installed a fresh copy of windows 10 pro. After re-downloading some stuff and msi-afterburner the temps hadn't changed at all. I thought that it might have been msi afterburner, so i downloaded speedfan only for it to tell me that my cpu was above 100 degrees. I quickly shut off my pc and entered the bios (B85-g43 GAMING) for it to tell me that my cpu was at 60-70 degrees. I decided to reset the cmos with the jumper connectors and restarted only for the bios to tell me that it was now 90 degrees and increasing i shat myself quickly turning off my pc i got a fresh install of windows 7 ultimate. After downloading all my stuff again i looked at the temps to see they have not changed one bit. Not using thermal paste and haven't been for about a year. Nothing on or in my pc had changed recently.