Comparing a 030 with a 040 is like comparing a VW Golf with a Porsche. The 040 has a much more advanced architecture and is able to be several times faster than the 030 on a clock per clock comparision basis. Ofcourse if you give the 040 a very bad memory/bus-interface as with the well known A3640-Card, it wont perform anywhere near its full potential. This is a bad simile, but it makes its point: If the 040 is a Porsche it would in the case with the A3640-Card be a Porsche fitted with bike-tires.
/Patrik