When I loaded a DOS window, the characters of the C:> prompt would take one second each to appear, and they'd overwrite each other. Input from the keyboard appeared similarly slowly, unless the program used its own keyboard interface (Turbo Pascal, for instance).
With the nVidia cards, there are still some very minor problems, but livable. They say AMD Radeon boards are better, so I have two cheap ones on order. My usage doesn't require $479 video boards, $47 boards are overkill.
They say the problem with the Intel on-board video is being addressed, but it may take some time, because it's really weird. It's the Intel / Microsoft approach - make it so weird and disorganized nobody can figure it out.