The RAM can be used for GWorlds, but I don't know if it has any other feature. Incidentally, found this rather nice article: http://www.mactech.com/articles/develop/issue_03/824GC_V007.html That article simply calls it DRAM for the GC kernel, so I might be wrong about resolution depending on it. However, LEM says it can go up to 1152 x 870, though I have never tried that resolution: http://lowendmac.com/video/apple8-24gc.shtml

Anyway, they appear to be 64-pin sticks, and they do resemble the IIfx sticks I have seen. The chip code is (Samsung?) KM44C256AJ-8.