Just bought an Rx 470 and it worked nicely with games like dota 2 at around 120 frames and rust at around 70-80, but now as of recently they dropped with dota running at 60 and rust from 30-40. I have a i3-6100 and 8gb of ram. I have the newest drivers and everything is up to date. Is there any way I can fix this or do I need a new GPU?