The measurements of some of the air-coolers on the custom 3080s are just ridiculous. The EVGA 3080 FTW3 vertical mounted wouldn't clear my Noctua cooler and the only reason it doesn't is because it is 5.38" tall. My 1080ti is 5.28" and it clears, but it's tight. The reason for the extra .1 inch on the EVGA? To accommodate the RGB light bar, because the heatsink actually ends .2 inches before the max card height.
Edit: Jesus, the ASUS ROG Strix is 5.51" tall. Looks like I won't be getting that one either.