Hi I am using an FX4100 @stock settings CPU. When it is idle the temperature is about 29°C and sometimes even 19-22°C. When I play some games with like 20-40% usage the temperature goes up to 90°C on the bottom of CPU and on top ~83°C. Pc is bought 7 months ago. It is using stock cooler. So is it supposed to overheat like that on custom cooler and custom speeds even if I switched on bios fan to TURBO mode with Q-fan. I noticed I lose performance especialy in the League of Legends where I have about 250-200 fps in the start, after 50 min gaming I have 60-80 fps. Maybe it is the game but I even noticed fps drops in Planetside2. My GPU is hd6770 1GB. I called my PC seller and they told me : 'the PC is not overheating because if it overheats itself it's gonna prevent it and shut down itself, than bring PC to us'. Sooo is this ok? Used HWmonitor, PCprobe, and CoreTemp to see temperatures.
Sounds to me like your having a problem with your thermal compund, or you may even have no thermal compound. Open your case, detach your cpu cooler, and check it out. Otherwise, it sounds like it may be a voltaging issue.
Will have to send it than to the PC seller because of Guarantee, I will say this same things you said. So maybe than they will open it and see for themself. Before this problem, when I first received pc I had graphics issue which caused BSOD in any game in first 5 minutes. They replaced GPU and now I have this issue, I didn't noticed this before. Voltage showings are ok in PCprobe and on HWmonitor. Everything is in range of 12V, 1.5V etc etc.
edit: One more question, can they fix my PSU issues, it is working loud and the sound is like GRUM GRUM GRUM GRUM, in periods, like the fan is hitting something.