All these "super builds" for Destiny 2 crack me up. It's not that intense of a game to run. Almost any 10 series card will run it flawlessly on max settings.
I'm only running on a 3770k i7 (OC'd to 4.3ghz) 16mb 1866mhz DDR3, and 2x 7970's. Unfortunately crossfire is garbage with most games, Destiny being no exception, so I'm stuck running 50-60 frames on high. Still looks and feels nice enough for now.