I once ran X on the ES1000, and X recognized it as a Radeon 7000 or somesuch. We have free accelerated 3D drivers for the Radeon 7000. IIRC I even tried 3D, and it worked.
I guess everybody has their memory play tricks on them sometimes. The ES1000 has no 3D capability. If you don't believe me you might read ATI's specifications for it, or the source of the free driver you're talking about.