A new display driver from nVidia's Quadro graphics boards allows AutoCAD's hidden-line visual style to access the CUDA GPU, resulting in a 5x faster display. Conceptual and realistic visual styles are also said to be faster, but no numbers were given by the press release.
The company's cheapest Quadra board is just $99. The updated drivers are available free from the nVidia Web site.
In the months/years to come, I expect we can see more of AutoCAD's functions handled by the Quadro board and its CUDA processor.