I wouldn't say that. I put a 512mb PC133 SODIMM and a 512mb DIMM in my G4 iMac. Nothing special, in fact, I have another one of those 512mb DIMM's in my PIII. The SODIMM and DIMM only cost me $215 together. I took the original 256mb DIMM and put it in one of my other PC's. Mac's have come a long way to become less proprietary. (Mind you, this all coming from someone that would have never even THOUGHT of owning a Mac a little over a year ago.)