Ok here we go. I have a stock cooler. When playing Dark souls III during boss fight its spins to 6500 rpm and it is loud. The temp hits max 80 degrees and tries going lower but not lower than 70 degrees during boss fight. I havent aplied thermal paste since the guy who takes care of my pc put it in. I have a classic pc box with no coolers attached. But what worries me is that I have started noticing this while playing DOOM 2016 and the pc shutting itself after 1 hour and 30 mins cause of high temps. Also at the same time the weather at my place started going hot(32 degrees during the day and 24 during the night) so it is probably connected cause before that I played for 4 hours non stop with no problems. Why would they add the turbo mode if I cant disable it??
I thought I heard it can be disabled but I have no experience with that so I can't say for sure, maybe someone else here might know
But I'm heavily doubting turbo mode is the sole cause of your overheating.
When was the last time you cleaned your computer out with some compressed air? If the answer is never then that could very well be the problem or at least a huge contributing factor as your CPU heatsink could end up looking something like this:
If you have a place to mount them and room to do so some case fans would also be beneficial.
It's also relatively common for stock CPU thermal paste to dry out after a few years, some new thermal paste I'm sure would help out as well.