I got an LC475 with a 3rd socket beside the two VRam slots. It´s a little bit smaller than the two VRams, and I have no idea what this could be.

At this pictures (nr. 4 + 5) you see there is no socket soldered at this 475, ...

http://geektechnique.org/projects/68040.html

Any idea, anyone? because I could´nt find something at the web.