Which games?Games seem to be built for 8 threads or less. I doubt 8700k will outperform 7700k in games or OC better.
The games that really need high-end CPU power have also started scaling well beyond 4-way parallelism (and a real core will always be faster than a SMT HW thread):
https://www.computerbase.de/2017-02...piele-test/#abschnitt_performancerating_in_hd
And this is comparing the 7700k to older HEDT CPUs, not its successor architecture.