I've had a msi r9 390 for roundabout 1,5 month now. I played games like Black Ops 3, GTA 5, Farcry 4 maxed out stable 60 fps (and put a cap on 60), but since a couple days it caps on 55 fps. Even when there is no cap set (nor ingame, nor in radeon crimson software). It is not that the 55 fps is...