Computer shuts down after some minutes

[plutomaniac]

I live in germany, we have summer, but just 16°C or sth. it's not the weather;-)

It could be. If during the winter the temperature was 6°C then your cpu was 10°C cooler. So, if it was running at 90°C then now it would be 100°C (TJMax => shut down). I know it's not exactly like that due to room temperature but just saying. It does play a significant role.

That's what I already did before, but games still kill my PC.

I see you underclock your cpu etc... so you may have accidentally raised the voltage or something. Maybe something else. Try setting the bios settings to default so that possibility can be eliminated.

I have to say it's one of the most annoying problems there is and not fixing it may ruin some expensive hardware. It certainly does reduce it's lifetime.

Yes, that's correct. It must be solved. You cannot let it reach TJMax all the time.