This message was posted on behalf of Intel Corporation
Thank you for contacting the Intel community.
Please bear in mind that these temperatures for this processor is totally normal and nothing to worry about it, this processor can work under normal work load at 100°C, you can check the TJUNCTION for this processor here:
I have seeing several customers complaining about this temperature but with this Intel® Core™ i7-7700K Processor this temperature is normal.
Also, when you do stress tests, it is expected that the temperature reaches 85°C or more and then when the stress test finishes it will go back to normal.
If your system detects critical temperature the system will automatically shut down when the silicon has reach an elevated temperature that risks physical damage to the product. At this point, the THERMALTRIP# signal will go active.
We recommend keeping your drivers and BIOS up to date, you should download the driver and latest bios version here:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
I hope this can help.