How important are SMBIOS settings, and what do they affect?

I am asking because I was and am struggling with unstable WiFi and Bluetooth. My witchhunt for problems lead me to buy lot's of antenna wire extenders, laptop antennas and etc, and still it is unstable. Funnily enough, it is the most stable when I have metal sidepanel off my case (probably there's something wrong with the connectors on the card itself and a closed case works as a Faraday cage). Anyways, there's my question in the title of the post. I can not use Ethernet since there is no way to get the cable to where PC is located without using Powerline (which I am considering)

I've been trying to use multiple SMBIOS settings, and stopped at the Mac Mini 8,1 for no particular reason. Guides for my CPU said that I should use iMac 18,X, but when I do, only one of the displays work, one that is connected to DVI on my gpu. The wifi/bluetooth card itself is originally from a Mid-2015 15inch MacBook Pro, so I guess I should use that SMBIOS? It kinda feels wrong to use it, and that is how my question was born.

• Hardware:

CPU: Intel Core i5 7500

GPU: Asus Radeon RX 460 2 GB

RAM: 16GB 2133 DDR4

Motherboard/Laptop model: Gigabyte GA-B250M-DS3H

Screen(s) Number: 2

Screen(s) Resolution: 1980x1200

Audio Codec: Realtek ALC888B (0x0887)

Ethernet Card: Realtek® GbE LAN chip (10/100/1000 Mbit) (could not find actual chipset info)

Wifi/BT Card: Broadcom BCM943602CS