I've made drastic changes to this closed question [How does the CPU and GPU interact in displaying computer graphics?][1]. Since it was a quite popular one with more than 300 views in just a couple of hours I'd really like to reopen it instead of posing a new question.

  [1]: https://superuser.com/questions/461022/how-does-the-cpu-and-gpu-interact-in-displaying-computer-graphics