Leave the video selection on auto. That way you'll be able to use both at the same time. Use the video card for a large project, use the Intel igpu to surf the web, watch youtube etc. I've done a "Big" project using the "P-cores" and 4080 Super" and used the "E-cores" & Intel 770 igpu to play an older game, Batman Arkyham Asylum at a locked 60fps at 1440p at the same time. No stutter.