http://www.pcgamer.com/nvidia-breaks-down-destiny-2s-graphics-options/

With Destiny 2’s PC launch on the horizon—you can start preloading it now—Nvidia have put together a graphics and performance guide to let you know what you’ll need to consider if you’re hoping to play it at 60fps or more. 

Both Nvidia and Bungie recommend the GTX 1060 for the highest settings and 1080p, but for 4K, you’ll be wanting something like the considerably more expensive 1080Ti, which will net you an average of 96.7fps on the high settings, and just below 60fps on the highest. This all depends on what else is crammed inside your rig, of course.