I just saw this funny video. The Mythbusters go and compare how a CPU and how a GPU draw things. Considering it’s the Mythbusters, it’s not really surprising that they use robots and paintball to demonstrate. Here ist the video
httpv://www.youtube.com/watch?v=fKK933KK6Gg
The second part in high resolution:
httpvh://www.youtube.com/watch?v=FllMX9dFmWg