resident evil 7 has a minimum spec of 2gb of vram, so unless you have the 2gb version of the 6870, Im gonna asume thats the issue. not all games actually require 2gb of vram to run, but some do. as to what i assume you are trying to say in the second paragraph, I have no idea why radeon settings would stop working / stop responding, only thing that i can recommend is a clean install. yeah the rx 460 is definately faster, its around the speed of a 7870, and a 7870 was any where from 10-50% faster depending on the title, though the variance was mostly due to the weak tesselation performance on the 6000 series cards . a 6870 would probably come in around 60-70% the performance of an rx 460 if tesselation is disabled. with tesselation enabled the rx 460 would probably be much much faster.