I'm upgrading a G4 Ti PowerBook 867. I need to install more RAM. The call out is for SDRAM PC1333U-333, 144-pin. I've been told that in the past that not all RAM is created equal, and that some of these units were and some were not compatible with MacIntoshes. Is there any guidance on the web on this matter (haven't found it). I couldn't find anything on the 'Fritter about it.