But the problem of DirectX that it can make direct3d acceleration available or not occasionally without any sign. Then I run game, it bottlenecked at that time and I have to restart my device to make it available again. The web video isn't corrupted anymore after I installed to the 30.0.101.1121(Beta) driver but it change to bottleneck when direct3d acceleration not available. Furthermore, I check task manager at the time Direct3d acceleration not available, I see the DirectX version is 11 though I have the 12 in dxdiag.