I just installed a new motherboard and I was wondering if I have to manually install all their drivers or does it automatically do it?
I have a Gigabyte B450M DS3H V2 mobo.
It won't automatically do it and you wouldn't want it to if it did. All you want to get from the motherboard mfr. are drivers for the LAN port and audio drivers. Leave everything else alone as they're most likely just poorly coded bloatware thats only going to slow your system down or, at best, are out of date.
Even the LAN and audio drivers are optional as Windows usually includes perfectly functional compatibility mode drivers that will do all most people need.
But do go and get chipset drivers from the AMD support web site. Get your GPU drivers from the...