In the right part of the image you can clearly notice the dithering effect. We've got the impression that OpenGL driver created miniatures in 256 colors. Now we are passing over to drawbacks. We revealed two major drawbacks of Direct3D drivers when displaying the viewports. The first one is the absence of textures correction.
Most boards are crooked.
OpenGL Here the things are alright, as you see. So, no work connected with laying textures can be done in this case. But this is far not the end. In Direct3D most transparent surfaces are displayed as non-transparent. There is a table in the middle lit by a light cone.