CompuServe Messages

I have got 2 machines running 3ds R3. A frame renders on the 486DX2-66 in under a minute. The same frame takes 5 mitues on an AMDDX4-100. I am using the star ixp as part of the image. I can't figure out what is slowing the DX4-100 down. There is sufficient memory on both machines to render without swapping to disk. The literature mentions that the ipas routines need an intel math co-processor. Is the co-processor in the AMD chip an Intel or Weitek? Thanks Larry Lee