Though the minimum requirements are posted as 128mb of graphics memory, the game seems to run adequately on a 64mb laptop intel cheapochip. I was surprised at how well, actually; the only problem was translucent planets (they seemed to be the only textures that didnt fully load.)
Of course, I'm sure the full version (with more races) will have more problems. But still, surprising.
There was one issue though, there was major graphics lag whenever a select disk was in the field of view, whether it was a gravity well or a ship or whatever. I think it was a transparency thing.