A friend of mine owns a Apple store here in Caracas (Venezuela) and we were trying out some suspicius memory modules he had. Well, he has a Pismo just like mine and one of the memories he had didn't work with his computer but worked perfectly with mine (he had it for a very, very low price in Miami). Some how he found out that after upgrating the sistem ROM of the computer to install OSX, the computer doesn't reconize that kind of memory, but my computer had OS 9.2 only and it didn't care. This memories where 2 250MB (I mean 256 sorry) put togather in the same chip, some wird experiment that I'm sure the new ROM can check. So, if you are using OS9 and plan to install OSX you may have some problems if your memory doesn't acomplish Apple standarts.