Why US needs GPU acceleration
http://www.youtube.com/watch?v=kHhkLyJLLYIover 2 million particles rendered in realtime on the GPU using CUDA
the video in the top left is fed into the GPU which assigns each pixel a particle then using the brightness of the pixel assigns a height to the particle, then it colours the particle with the original pixel colour.
(the music was added at a later date to fit the video)
imagine how quickly a GPU could throw the galxies around .... nevermind getting slowed down by a little dust in the asteroid belt