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Based on the information provided, your system is running within specifications. Please check more information about temperatures on https://ark.intel.com/.
Intel® Core™ i7-7700K Processor
Also, the temperature reported is expected since you are running demanding games/applications and temperature variation is normal. However, I would like to take a look at the Intel® Processor Diagnostic Tool report. Please run it and attach it to this thread.
To attach a file, you must click “Use Advanced Editor” on the upper right hand corner of the response box, then the “attach” option will appear on the bottom right hand corner of the response box.
-Have you tried loading default BIOS settings?
-Is the processor's memory and graphics overclocked?
In addition, keep in mind that BIOS usually reports if a thermal event has occured.