I just upgraded my Sapphire Radeon hd7850 to a r9 290 tri-x. Normal applications, web browsing and 2d applications seems to work well. The problem starts with games. Games that takes the gpu to 100% usage, seems to work perfectly, but when a game is running and don't push the gpu to the maximum black squares starts to appear all over the game window. If I open other 3d application that forces the gpu the errors disappears from the other applications. This only seems to affect d3d9 and d3d11 games opengl works well in every application I tested. Already whipped my drivers clean and reinstall them from scratch. Is there a known issue or I just have to ask for RMA?