check here also:
http://amiga.resource.cx/exp/a3001mk2apparently the 16-25mhz boards take 8mb on the ram board, and 50mhz could take 20mb.
Some gvp board could use the a2632 with 112MB ram, but i think that old 3001 will not,but check into it,i could be wrong. Jens made a new run of A2632's a while back.
some later gforce boards(040?) could take 64MB of special 16MB gvp simms($$$).