Help! +5V in bios constant at 6.9volts and 100 Celsius idle cpu temp!

[BearPan]

So, I’ve been at this for two days now, and I have no idea what else to do. For starters, I recently bought all these parts (pcpartpicker link to the build), and immediately noticed the voltage on the +5V in the bios was stuck at 6.9 volts. I honestly have no idea what I’m doing when it comes to more advanced mobo things, so I took to the internet; what was suggested was for me to check the psu, I changed this pc’s psu with my other pc, same result, reset the cpu, clean and reapply thermal paste to the cpu/heat sink, same result, change the battery on the mobo, same result, flash/update the bios, and I tried reapplying all the modular cables from the psu to their appropriate positions on the mobo. Nothing seems to fix it, by chance is it a faulty motherboard or a screwy cpu? 

build:

CPU: amd ryzen 7 2700x

GPU: sapphire Radeon rx 5700

Mobo: Asus ROG b450-f gaming

Bios used to update/flash: Asus 2901

 

[Spakes]

What about PSU?

UPD: Nevermind, didn't notice it...

Did you try changing your motherboard?

[BearPan]

I have not tried changing the mobo, I’m in the process of returning it 

[BearPan]

Best course of action after doing all those steps was to replace the motherboard and cpu