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Thank you for contacting Intel Communities.
Of course, we can definitely help you with your questions.
Actually, this is an expected behavior, and I wouldn't worry about this, you can review the following post regarding this topic:
Re: Thermal sensor issue i7-7700k?
In addition, you can check the following article regarding overheating issues:
Frequently Asked Questions about Temperature for Intel® Desktop and Mobile Processors
Computer Is Overheating Warning Signs
I hope this information helps.
Please don't hesitate in contacting us back if you need further assistance.
As the intel rep says this is normal behavior for these processors.
So i would advise against lowering the clock speeds or disabling boost.
As for the gaming performance of this vs Ryzen... Ryzen does now offer some decent performing chips at a price point most people want, but it does not outperform the 7700k at gaming.
So if you are having lower fps than your buddies there are 2 possible reasons. One is you are using a less powerful GPU, the other being that people tend to exaggerate their fps when speaking with others.
If neither of the above are true, then it might be a configuration issue on your system. If that is the case you can private message me and I will do my best to resolve the issue.