I hope you realize letting us know what components you are using plays a heavy factor in this.
But in general, yes, you should see a slight decline. How much, though, will depend on what components you're using.
Believe what is provided from the manufacturer website.
However, I don't see an F61a BIOs on the website - https://www.gigabyte.com/Motherboard/B450-I-AORUS-PRO-WIFI-rev-10/support#support-dl-bios
Regardless, as long as you're on something F60 or above you'll be fine.
Don't believe...
Bare minimum - https://www.mediaexpert.pl/komputery-i-tablety/podzespoly-komputerowe/zasilacze/zasilacz-be-quiet-pure-power-12-m-550w-80-plus-gold-pcie5-0
If you want headroom for extra upgrades -...
You can start by listing the make and model of all your parts.
Unless you are running a few microwaves next to you EMI shouldn't be an issue.
This sounds more like a system that's old and needs upgrades or you need to turn down your settings.
Either test it in another computer if you can or let it sit for a few days to completely discharge. There could be a chance it tripped some kind of current protection on the GPU and you just need to let it sit for a few days to discharge any left over electricity from the capacitors.
The cable for the wifi card is a standard USB plug.
Your motherboard may have a proprietary connection, not surprising since it's a Lenovo branded motherboard.