Have this exact problem but on my ranger viii mb, any help please,
https://rog.asus.com/forum/showthread.php?70838-HELP-CPU-Input-Voltage-High-and-Stuck-at-4-080V-RED-... , i just replied to that thread for help also.
Reply i posted to that thread below.
I have this exact same problem, found out when my pc would not start, and said overclock failed, ai suite shows cpu input voltage 4.080(guess that stops pc from booting), have a ranger viii, 6700k, once back to desktop thou, it runs all day while gaming with no problems, tried all the fixes in this thread and no joy, i am wondering did the original poster find out the problem, or did asus say if it was a problem with the motherboard ?