Putting a ppc card in an 040 Mac is blasphemy. One reason is why is anyone at this point using an 040 Mac as a main machine? Another reason is that a 6100, 7100 or 8100 can easily be had. As can a pci powermac. In fact biege and smurf G3's are about the cheapest Mac's that you can buy on eBay these days. 68k Mac's are just so much cooler than their ppc cousins.