First, you are correct in that the Intel video is disabled with descreet video card installed.
I get my Wi-Fi drivers through Windows and they are 184.108.40.206 currently.
Why are you trying to install SATA drivers? Are you trying to run RAID or have Optane Memory?
I run a 1000 Watt Power Supply with that video card.
I have Thunderbolt disabled in the Bios since I don't use it.
Those video cards can get very hot if the cooling air is not sufficient. It is important to make sure the exhausted hot air does not get back to the Intake fans.