See the difference between a slighter higher clock and a Vcore of 1.4 Volts and its effect on the temperature :
https://valid.x86.fr/gmmgl8
https://valid.x86.fr/w01ywy (in that case the system run 95% of the tasks ,but crash while running prime95) .
Beware that a higher OC has effect on the memory controller .
Hell no ! you can run a 2700x 4686 Mhz all core with 1.4 Volts ,the screenshot with the 2700x @ 4676.44 Mhz 1.134 Volts is hilarious and prove that you try to bullshitting us .
With that in mind you better stop advising people how to choose any computer component or what so ever !
Again for the topicstarter ,look at the QVL from your mobo and in case of Ryzen it's pointless to go over 3200 Mhz when you use the rig for gaming ,you better put that extra money into beer,chips, or girlfriend ?